My baby boy is 2.4 month old. His weight was 11 kg when he turns 2 and still his weight is 11kg.Its been 4 months, he has not gained a single gram. I am really worried. He is active, take all his 4 meals. However, he is not gaining a single gram weight. is there anything wrong about his food or routine. He use to sleep alround 1 Am in the night, wake up around 9 AM and take 2.5 hr sleep in daytime.