Holding in bowel movements

[Seycat]

Ok here's a weird one we can't figure out.
For the past 2 weeks, our 20-month-old daughter seems afriad of doing a poo in her nappies (we've yet to start potty training). She clenches and fights it with all her might and in the end, it stays in only for her to repeat the action an hour later when she needs to go again. Rather than squatting, she stands in a corner and her whole body goes rigid and she sometimes cries. We have changed her diet to include more wholegrains, veg and fruit, but it doesn't seem to be constipation. Any ideas anyone?

hi my 7 yo dd used to do the same and she still does .. she is now under a doctor and has to take movicol to help her go . its only now she says she holds it in cos it hurts to go .. and shes scared it will hurt again .. if i was u id nip this in the bud now befor she gets used to holding it in and itbecomes the norm like my daughter .