fran adult, yu should have it between 30-79 lbs it's considered overwieght at 80-99, and under wight at anything below 30. It varies i what ag your tamagotchi is in:
depends on the adult. The base weight for a "healthy" adult is 30, and the base weight for an "unhealthy" adult is 20. Your Billotchi is a healthy character so 30 is it's base weight.