Merlin's Magic Sleepsuit and development

I wanted to transition my 4 month old daughter from swaddling. I have 3 Halo sleep sacks & 2 swaddleme sacks. I had read great reviews on Amazon about the sleep suit and bought 2. She has slept great (7-8 hours) when we started using them. I then read other non-Amazon reviews and learned about the possibility of developmental delay. So I stopped using them. After 2 nights of trying to figure out how to put her to bed, sleep sacks in which she Houdini'ed her arms out, I stumbled upon the HOUDINI swaddle method. It WORKS and no additional products are needed. Yay!