Is he breastfed or formula?
Going over some gravel in the buggy. Always worked as a treat with mine
Important to note that when they do go, if it’s not hard then they’re not constipated. Probably just learning how to poop. If it’s harder consistency I’d speak to the GP about prescribing something for them to help move things along.
@Ellie formula fed
I experienced similar issue and “infacol” helped
Lots of tummy time - this can even be just on your chest. A baby carrier works well I found with my first. Keep doing what you’re doing because he is still learning as well. Lots of knees to chest and circles as well can help move things along. From his belly button, take two fingers go slightly to the your left (his right) and then go down, gentle press and twist. You can also try simulate his bum hole with a cotton bud and Vaseline.
F