When our Toto was small, we fed her tiny little meals 3-4 times a day [just a couple of teaspoons] and left kibble for her all the time. Most days, she hardly ate any of the kibble, but it was there if she wanted it. Their little stomachs are soooo tiny that it doesn't take much, but when they are young, they need lots more calories because they are non-stop energy!! Toto would play so hard, she would suddenly just curl up where she was and fall asleep. We found her in some of the oddest places!
Always make sure there is plenty of fresh, clean water available. Toto drinks lots of water and I put a clean bowl down several times a day. She has always been extremely healthy!
Good luck.