My newborn is 2M17D lately I just sent him to infant care. And I realised even since he go infant care, he is more cranky , sleep more and drink lesser milk than previous. He used to drink 100ml every 3 hours. Now he can sleep and drag until hours and drinks 90ml sometimes even lesser. And his weight is now 6kg. Isit normal? Or way underweight for a 2 months old baby boy?