What’s Inside: 6 Weeks

This week's major developments: The nose, mouth, and ears that you'll spend so much time kissing in eight months are beginning to take shape.

If you could see into your uterus, you'd find an oversize head and dark spots where your baby's eyes and nostrils are starting to form. His emerging ears are marked by small depressions on the sides of the head, and his arms and legs by protruding buds. His heart is beating about 100 to 160 times a minute — almost twice as fast as yours — and blood is beginning to course through his body. His intestines are developing, and the bud of tissue that will give rise to his lungs has appeared. His pituitary gland is forming, as are the rest of his brain, muscles, and bones. Right now, your baby is a quarter of an inch long, about the size of a lentil bean.

See what's going on in your uterus this week.Note: Every baby develops a little differently — even in the womb. Our information is designed to give you a general idea of your baby's development.How your life's changing: You may find yourself developing a bit of a split personality — feeling moody one day and joyful the next. Unsettling as this is (especially if you pride yourself on being in control), what you're going through is normal. Ricocheting emotions are caused partly by fluctuating hormones. But hormones aside, your life is about to change in a big way — and who wouldn't feel emotional about that?Spotting (spots of blood on your underpants or toilet tissue after urinating) or bleeding is relatively common in early pregnancy, affecting up to a quarter of pregnant women. It may occur in a normal pregnancy, but sometimes it can be the first sign of miscarriage or an ectopic pregnancy. If you have any spotting or bleeding, call your provider.