don't worry too much about your BB lar, my BB also only gain 0.4 kg in past 3 months, and his weight is about the lowest %, but as long as he is healthy and happy. don't need to worry. He is also a bad eater, but these days he finally eats more, he loves congee, he can takeup to 5 oz, but don't like rice cereal, only eat 2 -3 oz