Your baby son's weight is well above the average for baby boys of his age.So his weight gain is certainly not a problem.It is common for babies to struggle with constipation when on soya formulas.With the lactose free fomulas the lactose [ the natural milk sugar] has been removed so some babies are not too keen to drink these formulas.You can try starting your baby on a rice cereal [milk free] If his constipation does not improve it is a good idea to take your baby to the paediatrician.
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