Safe to lay 4 months old sleeping on side?

W

When my lo of 4 months falls asleep in my arms, it’s easiest to get her to stay asleep when laying her down in her bassinet on her side (as she already is in arms). Is this safe though, or should I put her on her back? The latter wakes her up most of the time.

She rolls from back to belly but doesn’t roll from belly to back by herself, insofar that would be relevant

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