Well, I know that the 6 yr molars are likely called that for a reason, lol! I keep intending to look up the "time table" on this, but haven't yet; I'd be interested as well.
My son, 9 yrs old, lost about 4 teeth in 2 days a mth ago. (bicuspids, I think; in the front, anyway. All were perfectly sound, roots dissolved away, and with new teeth coming in under them(so no mad rush to the dentist to find out why he was loosing his teeth!LOL!)
Seems like he went through a stage of loosing baby teeth between 3 and 4 or so, then a long lull, now this. (could very well have lost others and swallowed them or something, I guess)
So my anecdotal answer will be YES, getting teeth in at 4 is well withing the schedule, and well past that!
Now, is wanting to make a necklace out of your old baby teeth normal in a 9 yr old?
Kim, mom to Forest, 9 and Lily, 2