In my baby book it says baby's first smile should be at 5-6 weeks but online it said 6-8 weeks. My baby will be 6 weeks on Sunday and hasn't started smiling yet so I'm curious what other mom's experiences have been
Mine started between 5 1/2-7 weeks. If baby is not smiling yet at 6 weeks there's no reason to be alarmed. I think the normal range is about 5-8 weeks, some earlier dome a little later. I wouldn't worry until baby is at least 10 weeks old. Then it would be time to bring it up with the pediatrician. Remebered, all babies develop at a different pace.
I think that up to 3 months is still not something to be overly concerned about. Also, it depends what you consider a "smile" -- are you talking about a full-fledged smile, or just a slight upturn of lips? My older one gave his first smile by 5 weeks, but didn't really smile that often or master the skill until 3 months.
I think that 5-8 weeks is average. Don't sweat it at this point.