We swaddled with a miracle blanket for the first few months. I weaned her off it by swaddling her with legs out for 3 nights, one arm out for 3 nights, then the second arm out for three nights and then ditching the swaddle altogether. With mine, at least, she did NOT like abrupt changes - although I noticed that more past the 4 month mark.

Slightly off topic, but there are some interesting studies in other countries re: SIDS and flame retardant chemicals/fungi in mattresses. I found them to be an interesting read.
I haven't got the slightest idea how to change people, but I still keep a long list of prospective candidates just in case I should ever figure it out.