Maybe I am just being paranoid (probably) but my lo behaves very differently to his 3 sisters. Ever since he was born (he is turning a year tomorrow) he has appeared really serious. He doesn't gurgle and giggle and he plays mostly quietly. His physical development is normal as is his language and understanding. My other babies used to babble in bed, giggle unprovoked etc. A friend suggested its a boy-girl thing, I wonder whether that is true? Whenever we go somewhere new, he looks around him deadly seriously and won't smile, even when played with. He is afraid of many people, even my dad whom he sees once a week. When we play with him at home he is vocal and laughs, but not on his own accord, usually only when stimulated. Am I just being crazy to worry???