This is just a quick note to say what I did... Han always liked being wrapped but not with her arms in... well, they started in (folded so her hands were by her chin) but they always came out! I think Han liked the feeling of wrapping around her tummy... which is why the safety sleep worked so well with her. I think it came from me rubbing or resting my hand on her tummy when she was very little when trying to get her off to sleep.
Anywayyyy... I used only the wrap until Han figured out how to stand up in her cot (and couldn't figure out how/refused to get back down), from then on I 'tied her down' with the safety sleep. Took her safety sleep off when she got strong enough to wriggle over and stand up with it still attached to the bed! (How? I do not know)
If it works for Erin then good job!