This is really common and is the most frequent of the FAQs we receive!
It is also the exception to the ‘keep the nappy off after you start training rule’ as we recommend that if your child will only poo in a nappy then always give them a nappy to poo in. If you say no there is a danger they will either try to withhold, which can cause more issues, or they will go and hide and do it in their pants, which is then a harder habit to break.
There are a couple of ways to do this so that it is not a backward step into wearing nappies all the time. Always give the nappy in the bathroom and only to poo in. After the deed has been done ask the child to get involved in flushing it down the loo, telling them that this is where poo goes.
The next stage is to put an open nappy over a potty and get them to poo in that, then when they are comfortable doing this you can replace the nappy with kitchen towel, and eventually progress to nothing other than the potty or toilet.
Ensure the child is comfortable sitting on the potty and toilet – always use a step stool on the toilet as this gets them in a better position for pushing the poo out. Keep toys around them to help them stay relaxed and distracted long enough to do something. Health professionals that we work with recommend playing with bubbles as the blowing helps engage the right muscles.
Most of all, try to stay positive, and to keep your child positive about this. It is so common and you will get there!