I think that in general the males do have fatter casques and cheeks than the females. There is a male at the livefood shop who is just the same and he always seems to be shedding a different part whenever I go in there! As they age they shed different parts at different times rather than the full body shed that the babies go through. Amy's growth has slowed right down now, and it's been 3 months since her last shed. I think there is one imminent though - she's looking a bit 'frosty' at the moment, lol!
Yes, Lily was a fat girl. I didn't know any better when I got her and let her eat all that she wanted. When I got her (at 6 months of age) she was bigger than Amy is now at 8 months. Sadly, I learnt that overfeeding females is bad the hard way, and, so far, Amy is nowhere near as greedy as Lily was. Lily weighed 200g one month after she laid 102 infertiles, but I think that some of this weight was due to the fluid build-up inside her body cavity as she was sick.