What do your babies sleep in?

About to transition mine out of the zipadee zip to just a normal sleep sac with no sleeves.

1 - I'm worried his arms/hands might get cold. It is summer but we have a/c.

2 - Is he too old to be sleeping in a sleep sac/bag? My SIL has a baby of similar age and made it sound like it was strange that mine was still in any kind of sleep sac.

Advice/opinions welcome 🙂

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