My brother’s just-born is such a beautiful living wonder! Babies grow and learn astonishingly fast – so fast that it all seems miraculous. So, do all babies learn to sit, walk and run at specific “normal” intervals? Well, they do; however, this “normal” is a very broad range. Earlier, in search for this normal, psychologists and researchers studied toddlers. When African and American babies were compared, though, these people found that there was really no narrow normal!