Of course your baby needs to drink his milk as this is his main source of nutrtion.His weight is about 0.5kg below the average for a baby boy of 3 months.It is possible that he is showing the first signs of teething or he may have a problem with reflux.Try him on a special formula for baby's with reflux such as Novalac AR and see if he is happier on this formula. If there is no improvement it would be best to ask your paediatrician to see your baby son.
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