In some expert opinions, it’s noted that swaddling isn’t recommended when a baby starts to turn over by themselves, because they may get stuck like this while sleeping – and it’s considered unsafe for babies to sleep on their stomachs.
As well, there is some risk of hip dysplasia (developmental problems of the baby’s hips) if they are constrained too tightly by something like a swaddle for long periods of time, especially if the swaddle is too tight.