Thanks for the query
Since he has not passed stool for one week you can use Glycerine suppositories. For your kind information for an infant it is normal to pass stool 4-5 times a day to once in 4-5 days. You can also go for thyroid profile of the baby as hypothyroidism
is associated with constipation
. Once he passes stool after suppository consult you doctor to rule out other causes of constipation. If nothing is there then no need to worry, his bowel will be regular with age.
I hope this answers your query well
Wish you and your family good health