My 4 month old (very nearly 5 months) has pooed every 3-4 days for the past two months. Then 5 days ago he has suddenly starting pooing non stop, seems to be after every feed, sometimes multiple times. The poos aren’t substantial and vary in colour and consistency. Baby otherwise seems himself, haven’t noticed any rashes or excessive crying and the drs tested his stool and found no signs of infection. Have noticed he strains a little right before every poo. Has anyone else experienced this at all??