Be careful what you say around a pregnant woman. As a fetus grows inside a mother’s belly, it can hear sounds from the outside world—and can understand them well enough to retain memories of them after birth, according to new research.

It is well recognized that infants have no awareness of their own state, emotions and motivations. Although a newborn lacks self-awareness, the baby processes complex visual stimuli and attends to sounds and sights in its world, preferentially looking at faces.

It used to be thought that the reason we can’t remember much of our early childhood is because, as young children, we just aren’t able to make stable memories of events. You can’t access a memory, the logic goes, if it’s not there! But it turns out that infants and small children can and do form memories.

Babies are often more active at certain times of day, such as after you’ve eaten a meal or when you’re lying down in bed. (In contrast, your movement — such as a walk around the block — can lull them to sleep.) And, if your stomach is full (and taking up more room), you might be able to feel that movement even more.

Baby brains and skulls squish and change shape during birth, according to international researchers who used 3D scanning to capture images of seven babies being born. Doctors have long known baby heads change shape during birth, but the details have remained unclear.

When babies are born their skulls are soft, which helps them pass through the birth canal. It can take 9-18 months before a baby’s skull is fully formed. During this time some babies develop positional plagiocephaly. This means that there is a flat area on the back or side of the head.

In general, you should gain about 2 to 4 pounds during the first three months you’re pregnant and 1 pound a week during the rest of your pregnancy. If you are expecting twins you should gain 35 to 45 pounds during your pregnancy.