my first Tama was a Pyonchitchiand when she was a teen she was anorexique she didnt want to eat!!! I was woried!! h34r: but she got better with the adult age!!! Her child is not the same, he is a boy (young Mimitchi) and he eats well and play alot...
I guess its different for all Tamagochi...
Did you try do gave him more than one meal? So he can gain more weight.
My Mariutchi only plays after I feed him. He needs comfort food to get his courage up, at least I think so. That, or he just weighs Twelve Pounds and is too afraid of the other Gotchi's to play Bump without bulking up a bit.
All the tamas I have had tend to only excersize/play right after a snack when they are young, and after a meal when they are older...I wouldnt worry, I dont think that tamas can be anorexic!
I'm a bad owner. Mine's 83 lbs. Now its a grown up Kusatchi I don't bother because it cant grow anymore. I will do the same with her kid too. Feed and play until her weight is too low to play. Feed when hungry then play. I do this until grown up stage then give up. I only have them 4 3 days before they go back to Tama planet leaving their kid behind. I work on one Tama a week. One generatin a week. And bla bla bla I'm beginning to sound really boring. Don't listen to me in the future. I just go on and on and on and on and on... <_<