My baby is 3mo and it seems like his hair didn't grow since he was born. is that normal? is there anything I can do to help him have more hair?

does your baby's scalp look healthy with no skin irritation? if so, it's perfectly common for babies to not have any hair! here's some more info: http://www.newkidscenter.com/When-Do-Babies-Start-Growing-Hair.html