Diastasis Recti (DR) is a completely normal physical effect in the abdominal wall following pregnancy. All women will have a DR during their third trimester. It is caused by the stretching of the front walls of the abdominal muscles (rectus abdominis) to make space for your growing baby.
For some women, the gap will return to its pre-pregnancy state fairly soon after pregnancy. For some, it does not and you may be left feeling disconnected to your tummy, you may have a doming in your belly when you sit up, 'crepey' skin, a widening of the front abdominal wall that you can feel with your fingers. You may also have lower back pain or stress urinary incontinence.
THIS IS COMMON. And YES! It can be improved.