I agree with Ellen, it can be difficult to get out and about when they are so young and you are following a good schedule.
Our DD was so much happier sleeping in her cot than sleeping in trolley, car seat, buggy etc, so we did try to schedule things during activity time, but it can be hard when they only have 1 hour awake time.
One thing that did help us was when DD had a lovely with her, and she would then use that to go comfort her to sleep. She didn't attach to one until she was a few months old, but if your son has one already then it would help to take it with you.