Ovulation&

Pregnancy

In this calendar the assumption is that the woman has a normal cycle of 28 days, with ovulation taking place on day 14

Multiple Births

Determining Gender

ACTUAL SIZE

Prenatal DevelopmentFirst TrimesterDuring 1st month: (1-4) Blood begins circulatingBrain is just beginning to form, though it does not work yetDuring 2nd month: (5-8) Arms, legs, and internal organs begin formingGenitals are starting to form, but male and female still look alikeTail disappearsDuring 3rd month: (9-13)Male and female begin to look differentFingers, toes, and fingernails formThe head is almost half the size it will be at birth

19 Weeks8 inches

Prenatal DevelopmentSecond Trimester During 4th month: (14-17) Muscles moveSkin is transparentSweat glands, eyebrows, and eyelashes formDuring 5th month: (18-22) Hair, eyelashes, eyebrows formHiccups begin and other movement can be feltHeartbeat can be heardThere is hair on the headDuring 6th month: (23-27) Brain waves begin (brain starts working)Eyes openEars begin to workThere are fingerprints and footprints

Prenatal DevelopmentThird TrimesterDuring 7th month: (28-31) Adds body fat, Moves a lotResponds to soundSometimes awake, sometimes asleepDuring 8th month: (32-35) Less active, less wrinkledStill growing longer, heavierNails, bones begin to hardenDuring 9th month: (36-42) Lungs and other organs finish maturing (The brain won’t be fully mature for two more years andthen it will mature even more in the preteen and teen years and the reproductive system won’t finish maturing for years, either.)