I really feel you on this, being a first-time mum to a preterm baby means every little milestone feels so important to track. For preterm babies we usually go by their corrected age, so your girl is actually doing really well to be rolling at all at this stage. It is quite normal for them to do something a few times and then seem to "forget" it for a while, as they are still building up that strength and coordination. That said, since she was born early, it would be good to bring her to see your PD just to share what you have observed, so they can assess her development with her corrected age in mind and put your heart at ease.
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