Question 1

How many weeks is a full-term pregnancy?

Accepted Answer

A full-term pregnancy is 40 weeks, counted from the first day of your last menstrual period (LMP). Babies born between 37 weeks 0 days and 40 weeks 6 days are considered full term, while 39–40 weeks is considered ideal for delivery.

Question 2

When does each trimester start and end?

Accepted Answer

The first trimester covers weeks 1–13, the second trimester weeks 14–27, and the third trimester weeks 28–40 (through delivery). Each trimester brings distinct developmental milestones and physical changes.

Question 3

Why is my baby's size compared to fruits and vegetables?

Accepted Answer

Fruit and vegetable size comparisons are a simple, memorable way to visualize your baby's growth — from a poppy seed at week 1 to a watermelon at week 40. Each week page shows your baby's approximate length and weight alongside the comparison.

Question 4

How accurate are the weekly development milestones?

Accepted Answer

Milestones are based on standard fetal development timelines used in obstetrics. Individual babies develop at slightly different rates, so treat week guides as averages. Your healthcare provider's ultrasound measurements are the most accurate reflection of your baby's growth.

Question 5

Can I use the week-by-week guide if my due date changes?

Accepted Answer

Yes. If your provider revises your due date after an early ultrasound, simply switch to the week matching your new gestational age. The guides describe development by gestational week, so they stay accurate regardless of which dating method established your timeline.

Pregnancy Week by Week

First Trimester

Second Trimester

Third Trimester

How to use this week-by-week guide

Frequently Asked Questions