SO and also diapers.com things?

My husband never complain about doing errand or anything that has to do with his son. The only thing he complains about most of the time is doing household chores, he hated them! Most men do complain about doing errand, chores or anything that involves them moving off the couch. I don't know what your SO does for a living but maybe he was just tired and felt like resting. I totally understand when my husband who is a driver just wants to walk to the store (10 min) away walking. If it is not due to being tired than I would suggest telling him that he needs to do his part in this relationship that is not just you. Trust me if he is like this now he will get worst as time goes by wanting you to do everything. These are just a few suggestions no stranger on here know your relationship better than you.