Nita Stull wrote: Human > females who are regularly exposed to the pheromones of another female will > often synchronize their periods. I have come across this at work in the past but one thing I've been wondering recently is if menarche [first periods] can be brought forward by mixing with older girls. The reason I ask is that my daughter , just turned nine has started to sweat in armpits, have spots on facial "T" zone, beginnings of nipple changes.etc As she is very bright she is in a class with 11/12 year olds who look like they are going or about to go through puberty. She is very slim, correct weight for height, little body fat and eats a near paleo -low carb diet - no question of excess soya or similar phytoeostrogens. My menses started age 12-13. Alison