When you get a chest and it turns your tama into a baby it will lose a lot of pounds but when it grows to an adualt it grows more pounds hope I helped!!!
when i used the chest my tama turned into a baby and lost all it's pounds. and the hungry and happy hearts all disappeared. DON'T BUY THE CHEST AND TRY IT!!!!!!!!!!!!!!!!!
So far I've only had one, and it gave me a bottle of milk.
And who cares if it resets your current tama to a baby? You already know your current one won't last forever anyway... The programmers probably threw it in to be interesting.