10 weeks, a little late.

YOUR BABY THIS WEEK

This is the first week that your baby's weight is substantial enough to be measured! Still, he or she is tiny, weighing about 5 grams (0.18 ounces). About the size of a small plum, your baby is between 1.25 inches and 1.75 inches (4.4 cm) long.

Your Baby: This week signals the end of the "embryonic stage" and the start of the "fetal period". And with it comes rapid growth spurts. The good news is that the critical stage of development is over, and there is very little risk of developing congenital malformations from this point on. That doesn't mean you still don't have to be careful. Exposure to certain drugs, x-rays, alcohol, cigarette smoke, or even stress can still cause your baby harm.