Like another poster said: they tend to 'fill out' some but nothing substantial - not like 2-4 pds hehe
More like when a young lady comes of age and 'fills out'. Not really bigger - just more mature and suitable for adult life (carrying babies for example). I noticed it in my girls bum - her bum got wider haha. And was already wide because her poor legs are SO SHORT!
I pick on her bum all the time - I tell her shes got too much junk in that trunk!