Hi! GREAT question. Unless there is an indirect interference at play, no! Walking does not cannibalize hypertrophic gains. It’s a great way to get your movement up, bond with your baby, get your NEAT in, and get some fresh air.
Let’s say, for example, the walking was causing pelvic discomfort and tightness and that was impacting your mood, sleep, ability to lift, pelvic health, etc, that would be another story. BUT if there aren’t any red flags in your approach or discomfort you’re golden. Get it ma!!