CalculationTime

Baby Milestone Calendar

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CalculationTime

Baby Milestone Calendar

A printable family planner for baby milestone dates, first-year reminders, keepsake prompts and clear care boundaries beside the CalculationTime clockface.

Inputs, result, proof and time.

Use the instrument above, then check the calculation record, assumptions and related tools below.

Printable baby milestone calendar

Baby Milestone Calendar

Mon, 11 Jan 2027 to Sun, 06 Feb 2028
Birth basis
Tue, 12 Jan 2027
First birthday
Wed, 12 Jan 2028
Visible milestones
7
Care markers
1
Weeks shown56
Keepsakes1
Reminder lead7 days
Milestone setcore
Baby week 00 markers
Mon, 11 Jan
Tue, 12 Jan
Wed, 13 Jan
Thu, 14 Jan
Fri, 15 Jan
Sat, 16 Jan
Sun, 17 Jan
Baby week 11 markers
Mon, 18 Jan
Tue, 19 JanFirst week7 days old. Reminder Tue, 12 Jan. Settling-in marker for feeding, sleep and support notes.
Wed, 20 Jan
Thu, 21 Jan
Fri, 22 Jan
Sat, 23 Jan
Sun, 24 Jan
Baby week 20 markers
Mon, 25 Jan
Tue, 26 Jan
Wed, 27 Jan
Thu, 28 Jan
Fri, 29 Jan
Sat, 30 Jan
Sun, 31 Jan
Baby week 30 markers
Mon, 01 Feb
Tue, 02 Feb
Wed, 03 Feb
Thu, 04 Feb
Fri, 05 Feb
Sat, 06 Feb
Sun, 07 Feb
Baby week 41 markers
Mon, 08 Feb
Tue, 09 Feb
Wed, 10 Feb
Thu, 11 Feb
Fri, 12 FebOne month31 days old. Reminder Fri, 05 Feb. A simple month marker using the same day of month where possible.
Sat, 13 Feb
Sun, 14 Feb
Baby week 50 markers
Mon, 15 Feb
Tue, 16 Feb
Wed, 17 Feb
Thu, 18 Feb
Fri, 19 Feb
Sat, 20 Feb
Sun, 21 Feb
Baby week 61 markers
Mon, 22 Feb
Tue, 23 FebSix weeks42 days old. Reminder Tue, 16 Feb. Common postnatal check window; confirm local care timing.
Wed, 24 Feb
Thu, 25 Feb
Fri, 26 Feb
Sat, 27 Feb
Sun, 28 Feb
Baby week 70 markers
Mon, 01 Mar
Tue, 02 Mar
Wed, 03 Mar
Thu, 04 Mar
Fri, 05 Mar
Sat, 06 Mar
Sun, 07 Mar
Baby week 80 markers
Mon, 08 Mar
Tue, 09 Mar
Wed, 10 Mar
Thu, 11 Mar
Fri, 12 Mar
Sat, 13 Mar
Sun, 14 Mar
Baby week 90 markers
Mon, 15 Mar
Tue, 16 Mar
Wed, 17 Mar
Thu, 18 Mar
Fri, 19 Mar
Sat, 20 Mar
Sun, 21 Mar
Baby week 100 markers
Mon, 22 Mar
Tue, 23 Mar
Wed, 24 Mar
Thu, 25 Mar
Fri, 26 Mar
Sat, 27 Mar
Sun, 28 Mar
Baby week 110 markers
Mon, 29 Mar
Tue, 30 Mar
Wed, 31 Mar
Thu, 01 Apr
Fri, 02 Apr
Sat, 03 Apr
Sun, 04 Apr
Baby week 120 markers
Mon, 05 Apr
Tue, 06 Apr
Wed, 07 Apr
Thu, 08 Apr
Fri, 09 Apr
Sat, 10 Apr
Sun, 11 Apr
Baby week 131 markers
Mon, 12 AprThree months90 days old. Reminder Mon, 05 Apr. Quarter-year photo, growth and routine planning point.
Tue, 13 Apr
Wed, 14 Apr
Thu, 15 Apr
Fri, 16 Apr
Sat, 17 Apr
Sun, 18 Apr
Baby week 140 markers
Mon, 19 Apr
Tue, 20 Apr
Wed, 21 Apr
Thu, 22 Apr
Fri, 23 Apr
Sat, 24 Apr
Sun, 25 Apr
Baby week 150 markers
Mon, 26 Apr
Tue, 27 Apr
Wed, 28 Apr
Thu, 29 Apr
Fri, 30 Apr
Sat, 01 May
Sun, 02 May
Baby week 160 markers
Mon, 03 May
Tue, 04 May
Wed, 05 May
Thu, 06 May
Fri, 07 May
Sat, 08 May
Sun, 09 May
Baby week 170 markers
Mon, 10 May
Tue, 11 May
Wed, 12 May
Thu, 13 May
Fri, 14 May
Sat, 15 May
Sun, 16 May
Baby week 180 markers
Mon, 17 May
Tue, 18 May
Wed, 19 May
Thu, 20 May
Fri, 21 May
Sat, 22 May
Sun, 23 May
Baby week 190 markers
Mon, 24 May
Tue, 25 May
Wed, 26 May
Thu, 27 May
Fri, 28 May
Sat, 29 May
Sun, 30 May
Baby week 200 markers
Mon, 31 May
Tue, 01 June
Wed, 02 June
Thu, 03 June
Fri, 04 June
Sat, 05 June
Sun, 06 June
Baby week 210 markers
Mon, 07 June
Tue, 08 June
Wed, 09 June
Thu, 10 June
Fri, 11 June
Sat, 12 June
Sun, 13 June
Baby week 220 markers
Mon, 14 June
Tue, 15 June
Wed, 16 June
Thu, 17 June
Fri, 18 June
Sat, 19 June
Sun, 20 June
Baby week 230 markers
Mon, 21 June
Tue, 22 June
Wed, 23 June
Thu, 24 June
Fri, 25 June
Sat, 26 June
Sun, 27 June
Baby week 240 markers
Mon, 28 June
Tue, 29 June
Wed, 30 June
Thu, 01 July
Fri, 02 July
Sat, 03 July
Sun, 04 July
Baby week 250 markers
Mon, 05 July
Tue, 06 July
Wed, 07 July
Thu, 08 July
Fri, 09 July
Sat, 10 July
Sun, 11 July
Baby week 261 markers
Mon, 12 JulySix months181 days old. Reminder Mon, 05 July. Half-year milestone for family notes and care discussions.
Tue, 13 July
Wed, 14 July
Thu, 15 July
Fri, 16 July
Sat, 17 July
Sun, 18 July
Baby week 270 markers
Mon, 19 July
Tue, 20 July
Wed, 21 July
Thu, 22 July
Fri, 23 July
Sat, 24 July
Sun, 25 July
Baby week 280 markers
Mon, 26 July
Tue, 27 July
Wed, 28 July
Thu, 29 July
Fri, 30 July
Sat, 31 July
Sun, 01 Aug
Baby week 290 markers
Mon, 02 Aug
Tue, 03 Aug
Wed, 04 Aug
Thu, 05 Aug
Fri, 06 Aug
Sat, 07 Aug
Sun, 08 Aug
Baby week 300 markers
Mon, 09 Aug
Tue, 10 Aug
Wed, 11 Aug
Thu, 12 Aug
Fri, 13 Aug
Sat, 14 Aug
Sun, 15 Aug
Baby week 310 markers
Mon, 16 Aug
Tue, 17 Aug
Wed, 18 Aug
Thu, 19 Aug
Fri, 20 Aug
Sat, 21 Aug
Sun, 22 Aug
Baby week 320 markers
Mon, 23 Aug
Tue, 24 Aug
Wed, 25 Aug
Thu, 26 Aug
Fri, 27 Aug
Sat, 28 Aug
Sun, 29 Aug
Baby week 330 markers
Mon, 30 Aug
Tue, 31 Aug
Wed, 01 Sept
Thu, 02 Sept
Fri, 03 Sept
Sat, 04 Sept
Sun, 05 Sept
Baby week 340 markers
Mon, 06 Sept
Tue, 07 Sept
Wed, 08 Sept
Thu, 09 Sept
Fri, 10 Sept
Sat, 11 Sept
Sun, 12 Sept
Baby week 350 markers
Mon, 13 Sept
Tue, 14 Sept
Wed, 15 Sept
Thu, 16 Sept
Fri, 17 Sept
Sat, 18 Sept
Sun, 19 Sept
Baby week 360 markers
Mon, 20 Sept
Tue, 21 Sept
Wed, 22 Sept
Thu, 23 Sept
Fri, 24 Sept
Sat, 25 Sept
Sun, 26 Sept
Baby week 370 markers
Mon, 27 Sept
Tue, 28 Sept
Wed, 29 Sept
Thu, 30 Sept
Fri, 01 Oct
Sat, 02 Oct
Sun, 03 Oct
Baby week 380 markers
Mon, 04 Oct
Tue, 05 Oct
Wed, 06 Oct
Thu, 07 Oct
Fri, 08 Oct
Sat, 09 Oct
Sun, 10 Oct
Baby week 391 markers
Mon, 11 Oct
Tue, 12 OctNine months273 days old. Reminder Tue, 05 Oct. Three-quarter-year marker for habits, childcare and keepsakes.
Wed, 13 Oct
Thu, 14 Oct
Fri, 15 Oct
Sat, 16 Oct
Sun, 17 Oct
Baby week 400 markers
Mon, 18 Oct
Tue, 19 Oct
Wed, 20 Oct
Thu, 21 Oct
Fri, 22 Oct
Sat, 23 Oct
Sun, 24 Oct
Baby week 410 markers
Mon, 25 Oct
Tue, 26 Oct
Wed, 27 Oct
Thu, 28 Oct
Fri, 29 Oct
Sat, 30 Oct
Sun, 31 Oct
Baby week 420 markers
Mon, 01 Nov
Tue, 02 Nov
Wed, 03 Nov
Thu, 04 Nov
Fri, 05 Nov
Sat, 06 Nov
Sun, 07 Nov
Baby week 430 markers
Mon, 08 Nov
Tue, 09 Nov
Wed, 10 Nov
Thu, 11 Nov
Fri, 12 Nov
Sat, 13 Nov
Sun, 14 Nov
Baby week 440 markers
Mon, 15 Nov
Tue, 16 Nov
Wed, 17 Nov
Thu, 18 Nov
Fri, 19 Nov
Sat, 20 Nov
Sun, 21 Nov
Baby week 450 markers
Mon, 22 Nov
Tue, 23 Nov
Wed, 24 Nov
Thu, 25 Nov
Fri, 26 Nov
Sat, 27 Nov
Sun, 28 Nov
Baby week 460 markers
Mon, 29 Nov
Tue, 30 Nov
Wed, 01 Dec
Thu, 02 Dec
Fri, 03 Dec
Sat, 04 Dec
Sun, 05 Dec
Baby week 470 markers
Mon, 06 Dec
Tue, 07 Dec
Wed, 08 Dec
Thu, 09 Dec
Fri, 10 Dec
Sat, 11 Dec
Sun, 12 Dec
Baby week 480 markers
Mon, 13 Dec
Tue, 14 Dec
Wed, 15 Dec
Thu, 16 Dec
Fri, 17 Dec
Sat, 18 Dec
Sun, 19 Dec
Baby week 490 markers
Mon, 20 Dec
Tue, 21 Dec
Wed, 22 Dec
Thu, 23 Dec
Fri, 24 Dec
Sat, 25 Dec
Sun, 26 Dec
Baby week 500 markers
Mon, 27 Dec
Tue, 28 Dec
Wed, 29 Dec
Thu, 30 Dec
Fri, 31 Dec
Sat, 01 Jan
Sun, 02 Jan
Baby week 510 markers
Mon, 03 Jan
Tue, 04 Jan
Wed, 05 Jan
Thu, 06 Jan
Fri, 07 Jan
Sat, 08 Jan
Sun, 09 Jan
Baby week 521 markers
Mon, 10 Jan
Tue, 11 Jan
Wed, 12 JanFirst birthday365 days old. Reminder Wed, 05 Jan. One-year milestone and celebration planning anchor.
Thu, 13 Jan
Fri, 14 Jan
Sat, 15 Jan
Sun, 16 Jan
Baby week 530 markers
Mon, 17 Jan
Tue, 18 Jan
Wed, 19 Jan
Thu, 20 Jan
Fri, 21 Jan
Sat, 22 Jan
Sun, 23 Jan
Baby week 540 markers
Mon, 24 Jan
Tue, 25 Jan
Wed, 26 Jan
Thu, 27 Jan
Fri, 28 Jan
Sat, 29 Jan
Sun, 30 Jan
Baby week 550 markers
Mon, 31 Jan
Tue, 01 Feb
Wed, 02 Feb
Thu, 03 Feb
Fri, 04 Feb
Sat, 05 Feb
Sun, 06 Feb
First weekTue, 19 Jan 2027 - 7 days oldReminder: Tue, 12 Jan 2027. Settling-in marker for feeding, sleep and support notes.
One monthFri, 12 Feb 2027 - 31 days oldReminder: Fri, 05 Feb 2027. A simple month marker using the same day of month where possible.
Six weeksTue, 23 Feb 2027 - 42 days oldReminder: Tue, 16 Feb 2027. Common postnatal check window; confirm local care timing.
Three monthsMon, 12 Apr 2027 - 90 days oldReminder: Mon, 05 Apr 2027. Quarter-year photo, growth and routine planning point.
Six monthsMon, 12 July 2027 - 181 days oldReminder: Mon, 05 July 2027. Half-year milestone for family notes and care discussions.
Nine monthsTue, 12 Oct 2027 - 273 days oldReminder: Tue, 05 Oct 2027. Three-quarter-year marker for habits, childcare and keepsakes.
First birthdayWed, 12 Jan 2028 - 365 days oldReminder: Wed, 05 Jan 2028. One-year milestone and celebration planning anchor.

Assumptions

Dates start from the supplied birth date. Weeks 0 to 55 are shown. 7 reminder days are subtracted from each listed milestone. Month anniversaries keep the same day number where possible and clamp at the end of shorter months.

Notes

Use this sheet for family planning, photo prompts and conversation notes. Confirm health checks, vaccinations, feeding, sleep and developmental concerns with qualified local care providers.

Limits

This is family date arithmetic, not medical advice, developmental screening, vaccination guidance, diagnosis, emergency triage or childcare policy.

Baby Milestone Output Room

Keep the family planner printable, practical and medically bounded

The tabs separate date arithmetic, print behavior, private family notes and source limits so milestone planning stays useful without pretending to be care advice.

Date arithmetic

What the planner calculates from the birth basis

The working calendar starts from the supplied birth date or expected birth date, then adds day offsets and month anniversaries to create a visible milestone schedule.

  • Month anniversaries keep the same day number where possible and clamp to shorter months.
  • Reminder dates subtract the selected lead time from each listed milestone.
  • Care-window labels are planning prompts only, not medical instructions.
birth basis + milestone set + reminder lead -> printable first-year calendar

Method

The planner projects milestone dates from one birth-date basis

The calendar starts with a birth date or expected birth date, then adds fixed day offsets and month anniversaries. Month anniversaries keep the same day number where possible and clamp to the last day of shorter months.

Reminder dates

Each milestone also prints a reminder date by subtracting the selected lead time, so family photos, appointments and notes can be prepared early.

Print path

The print button opens browser print. The print stylesheet keeps the header, summary, week grid, milestone list, assumptions and limits.

Limits

This is not medical advice, a developmental assessment, vaccination guidance, emergency triage, childcare policy or a replacement for qualified local care.

Source Notes

Family milestone dates are mechanical; health timing is local

CalculationTime uses browser Date objects for local Gregorian date stepping and HTML date inputs for YYYY-MM-DD values. Care-window markers are transparent planning prompts only; vaccination schedules, development checks and medical decisions must be confirmed with qualified local services.

ReferencesECMAScript Date objectsHTML date inputWHO infant and newborn health topicCDC developmental milestones