Sleeping bags

Can anyone recommend where to get a 1.5 tog sleeping bag that will fit new born? We have one that's perfect with extra poppers so it can be fitted to newborn size but that's no longer stocked. All the ones we've looked at don't have extra poppers so baby could slide down and the tommee tippee one has reviews saying they're too small We tried a cellular blankets the first few nights but baby seemed a little cold and settles so much in his sleeping bag