Guidelines For Telling A Kitten`s Approximate Age?

I`m sure this is kind of a dumb question but I have no experience guesstimating feline age. I`m curious as to how old my kitten may be. She strikes me as maybe being midway along her kittenhood?She was fully weenied and seemed able to avoid obvious harm,yet still a kitten. Not sure but it looks like she still has her baby teeth. I will try and post some webcam pics of Alley later on.

At what age is a kitten considered grown? When do females become sexually active or have their first heat?I`m positive she`s old enough to get spayed.

I`d be interested in finding a lifespan chart that goes from birth to adult.

Thanks for reading!
HosMan

a vet is the best one to age kitty... most cats reach sexual maturity at about 6 months but are not fully grown till 12-18 months

first heat can happen as early as 3 months most 5-7 months

adult teeth start coming in about 4 months

Here is a chart that goes up to 12 weeks.
http://www.boutiquekittens.com/index.php?id=206

These go up to a year.

http://www.for-the-love-of-cats.com/Kittens.html

http://cats.about.com/cs/kittencare/...nfirstyear.htm

Thanks!! Those links were really helpful. I appreciate it.

HosMan