I had K in the HAB a lot during the day, almost every day when he was younger in fact. He slept through the night from 10w (apart from a few rough patches here & there) so it didn't cause any probs for him. DS2 however has a lot of issues with sleeping at night (with sleeping any time actually) so he's just about permanently in my arms or the HAB because of that, but his sleep issues weren't caused by being carried all the time. Hope that's reassured you a bit.