I don't know how old he is, but I had some similar concerns when DS was about 4 or 5 months. We were visiting family and everyone got into my head about how he wasn't sitting up (assisted) because his diaper was too big. Well, within weeks he was sitting without assistance and he was an early crawler and walker after that. I really don't think that cloth hampers gross motor skills-- after all, that's how people lived and learned to walk forever before sposies came out. I've also heard from others that some physical therapists actually recommend CD if a baby is having problems.
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That said, you don't want your babe drowning in that bulky diaper! I started pad folding my small PFs into the cover. You simply fold it and lay it in. At night I still snappi, but during the day when his absorbency needs are less this works great. I have never seen Nicki's so I can't compare it to anything else, but I do like the GroVia and use that a lot during the day. We also have Thirsties and had Bummis. I don't love Bummis because the PUL is a little thicker. Thirsties would probably be good for pad folding because they have gussets so you will have better poop containment.
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If you are interested in branching out to pockets, Fuzzibunz are probably the trimmest cloth diaper I've ever seen. I have a small stash of pockets and AIOs that I use for going out. I find they are easier to manage and remember to bring with me!