There are several different abdominal muscles:

The external oblique muscles, internal oblique muscles, rectus abdominis muscles, transversus abdominis muscles. Your abdominal muscles support your body and give you core stability.

What is abdominal separation?

Abdominal separation is a common condition. It is also called ‘diastasis recti’ or ‘DRAM’ (diastasis of rectus abdominis muscle). The long muscles of your abdomen (rectus abdominis) run from your chest to your pelvis. They lie just under the skin, down the middle of your belly. Abdominal separation is when these 2 long muscles separate from each other. Abdominal separation may start in the second half of your pregnancy. It’s a natural adaption to your growing baby. Abdominal separation often gets better in the first 6 to 8 weeks after having your baby.