#AskTheExpert do I need to check baby's thyroid level after 3 months ,he has constipation,and he gains weight fast he's 7kg now after 3 months, exclusively breastfed .on birth screening was normal

A. Hello mom yes you may check ones not a issue , as the weight gain too rapid normally babies are expected to gain about 300 gm to 1 kg monthly and by the age of 4 to 6 months they double their birth weight