Hi my youngest child who is ten month old has severe hypomobility syndrome this affects her lower back hips knees and feet as a result she dose not sit unsuported and dose not weight bear at all. She has a xorner seat for sitting and feeding and wears pedro boots. She has a good cot mattress but gets very uncomfortable laying for long periords of time which causes her to wake every hour or so during the night. Wod anybody have any advice on where i could get a good cot mattrsss to fit in with her needs we have looked at air matresses which curcate air from one pannell to another but was looking for other advice or suggestions first thanxs