Dd is 17 weeks (13 weeks adjusted as was 4 weeks premature) and is small - on 2nd centile for her adjusted weight, but is rather long and slim. She's just under 5kg, about 58cm but her neck and head in particular are small.
She's currently in a size 3-6 month Jersey type sleeping bag from jojo maman Bebe which is a good length for her although the sleeves are way too long, but in addition to waking to feed is waking frequently for no apparent reason and I think she's cold. At least she feels on the cold side to me. I bought a cozy looking sleeping bag from gap but she's way too slim for it - her head and neck just sink down into it through the neck hole so we can't use it yet.
Any suggestions for one with a smaller neck hole would be gratefully received.