Hiya, we’ve just come back from hospital with my 18 month old, breathing related with a viral induced wheeze, a mum there told me about the owlet sock to measure the o2 levels, I went and bought it from curry’s but just noticed it’s up to 18 months ….oops, expensive mistake. She said it goes up to 5 years, I cannot find anywhere in the uk online that is selling a sock for the toddlers? Is this a thing?