Thanks for your query.
and watery eyes are part of viral illness and takes some days to settle.
I suggest you to ;
-put saline drops in both nostrils 4 to 5 times a day.
-Gently clean his eyes with sterile water 2 to 3 times
-use humidifier in room .
-Decongestant drops can be used as per dosage .
In case his symptoms do not get better get him examined by pediatrician
for proper management.
Wishing your baby good health