The sizing was weird. Bought a 2-12 month size, but it would have been massive on a 2mo bub. I think it's definitely a good one for around 19-20degrees in babies room. Washes well, bub seems happy in it, like the 2 way zip for midnight poo-namis. I do think you need to add something to the arms in winter though, as a onesie isn't really enough. I wish it came with a full arm option.