End of First Trimester - Third Month

During the third month your baby’s bones begin to harden. Your baby is already moving spontaneously, but you usually can’t feel these movements for awhile yet. Your baby’s eyes are large and open. Eyelids will form later. External ears have formed. External genitalia begin to separate, though it’s still very difficult to tell whether your baby is a girl or a boy without genetic screening. Your baby moves from being an embryo to a fetus. S/he also loses their tail. S/he also weighs about 14 grams and is approximately3 1/2 inches in length. By the end of this month, you should be able to hear your baby’s heart beat with a Doppler.