We used the GRO Company swaddle for the first couple of months (my son was small but not tiny at birth and was still fine with the minimum weight), then the love to dream transition Swaddles as he rolled early and we needed 1 arm out, the snuz ones from 5 months as he was finally happy with both arms out and I've now had to order some more in size 6-18 months. I wouldn't worry about getting a stock in as you'll never know what they will like until they are born. Just focus on the first size. They grow so fast anyway!