Thank you for your query on Healthcare Magic.
It seems your child passing frequent urine in excessive quantities.
First I would like to rule out excessive dilution of his feeds and milk with water.
So check for the appropriate reconstitution of his feeds.
Second is cool weather will lead to excessive urination.
But frequent urination
and excessive urination has to be evaluated further to rule out the urinary infections, diabetes mellitus
and diabetes insipidus
I advise you to collect a 24 hour urine to know the exact quantity of urine by weighing the pre and post void diapers in a 24 hour period.
Urine has to be checked for any infection and presence of sugar.
Consult your Pediatrician
for further evaluation.
Hope I have answered your query.