Babies are born with 300 bones, but by adult we have only 206 in our bodies. The reason? Some bones fuse together later. A newborn baby’s head accounts for about one-quarter of it’s entire weight. According to researchers at the University of Texas, babies like pretty faces better than plain ones. A fetus in the womb can hear. Tests have shown that fetuses respond to various sounds just as vigorously as they respond to pressures and internal sensations.