Following on from a constipation thread I started a week or so ago....
DD is 2.3, and over the last couple months has suffered from pretty bad constipation. It was awful, but finally with lactulose she started to become regular again and it stopped being such an issue. We had started to wean her off the lactulose to see how she got on but she obviously wasn't ready and became bunged up again.
We upped her lactulose straight back up (2x10ml a day) but now she is actively holding her poo, only tiny bits were coming out which really really irritated her bum and she ended up with terrible nappy rash which was weeping. As a result, she was even more reluctant to go, and I fear we are going to be in a vicious cycle.
We have Movicol but she won't take it disguised in any drink (she is VERY stubborn head strong).
It's heart breaking seeing her struggle and strain, she clenches her bum as tight as she can and stands on her tip toes (she's in nappies and won't at this time even make eye contact with a potty or toilet seat!). Her nappy rash has now stated to improve using a couple creams I was recommended, and when she has managed to go it's been quite soft so don't think she's constipated - it's definitely a reluctance to poo due to her recent bad experience.
I really don't want this to develop into a long term issue, which I'm aware it might be as it's a hard cycle to break. Both my DNeice and DNephew had similar problems when they were young and now they are older and still have issues with going to the toilet 
Any advice or similar experiences greatly appreciated