When you first hatch your tama. After a few hours (2-3) it will poo. Then it will get ill. When you have cured it it will sleep for five minutes. Five minutes after it wakes it will grow. Don't worry the new character is alot easyer to look after.
When you inject your Tama it will get cross so give it a snack!
Games will lower the tamma's weight by 1 oz so you can put it on a diet!
Use snacks to fill up hearts if you are in a rush
Watch your Tam's eyes when playing. Hit the button when the eyes are the same each time
Snacks add on 2oz, meals add on 1oz and each full game takes off 1oz
Turning the lights on and off wether Tam is asleep or not doesn't seem to make any difference