Merlin sleep suit isn’t working

Kiki

I thought the Merlin sleep suit was pure magic like it claims. It worked amazing for my first born, sleeping through the night and then some. My 3 1/2 month old now it’s not working at all. He thrashes around so much in it I’m seriously considering moving him to his own room.

Anyone have any other recommendations? He was an early roller so he’s been out of swaddle since about 2 months. I’m thinking of just trying arms out swaddle or a sleep sack? But am worried because he still has the Moro reflex.