My six month old usually has about six wet/dirty nappies a day from when she gets up at 6am till bedtime at 7pm, she also poos everyday. Today she has not pooed and has only had 3 wet nappies, I changed her at 4pm as it had been a few hours but it was still dry. She has been feeding as normal (every hour, she has always been like this) had a bit of Ella's porridge pouch for breakfast then some sweet potato for lunch and offered her water with both meals. Should I be concerned?