three different problems

I don't know what else to do with my eldest son Raul. He eats very little almost everyday. He depends mostly on his milk to keep his energy up. I'm worried he'll not get all the nutrients that he should get at his age. When he does eat, he'll eat very little portion as compared to his sister Lisa.

Lisa, on the other hand, is chubbier and she weighs just the same with Raul. She eats quite a lot but she's very active too. Her problem would be she'll poo after each heavy meal. Haiyooo....and now she's supposed to be toilet-trained but she just refuses to go to the toilet and poo or pee. I don't know why.

Ezra, the baby is another problem. He keeps on vomiting. After each feed, he'll burp then vomit the excess milk he'd consumed. But i think it's too much. When we go out we will smell like vomit as he keeps on doing it. So, whenever i go out i have to bring a big towel.