He's a cutie! I don't think he's anywhere near a year old, not in that picture anyway.
If he's hungry you can offer as much as he will eat, he may regurge if he eats too much but they usually will only do that once and then learn. They are really good at knowing when they have had enough.
How do you have him set up now?
Here is the care sheet from this site, it will get you going rather nicely!