Your Pregnancy Calendar: Month by Month Summary

Month 1 (Weeks 1-4): Fertilization and implantation occur. Baby is the size of a poppy seed. Symptoms are absent or very mild. Month 2 (Weeks 5-8): Heart begins beating, organs are forming. Baby is the size of a blackberry. Nausea and fatigue may be intense. Month 3 (Weeks 9-12): All organs have formed, fingers have separated. Baby is the size of a lemon. Nausea may begin to decrease.

Month 4 (Weeks 13-16): Sex can be determined, facial expressions form. Baby is the size of an avocado. Energy increases, appetite may open up. Month 5 (Weeks 17-20): First movements may be felt, hair begins to grow. Baby is the size of a mango. Time for the detailed ultrasound. Month 6 (Weeks 21-24): Hearing develops, eyebrows and eyelashes become defined. Eyelids open in the 7th month (weeks 26-28). Baby is the size of a corn cob. Belly is prominent, leg cramps may begin.

Month 7 (Weeks 25-28): Brain develops rapidly, sleep cycle forms. Baby is the size of an eggplant. 3rd trimester begins, fatigue may return. Month 8 (Weeks 29-32): Bones harden, lungs mature. Baby is the size of a squash. Frequent urination, shortness of breath, and Braxton Hicks contractions may be felt during this period.

Month 9 (Weeks 33-36): Baby moves into birth position, stores fat. Baby is the size of a pineapple. Completing birth preparations is a good idea. Month 10 (Weeks 37-40): Baby is fully developed, ready for birth. Baby is the size of a watermelon. Labor can start at any moment — recognizing the signs is very valuable!