Little potty

ashbash4 • Mommy to Carl and Cora; LOVE THE LIFE YOU LIVE; fuck what anyone says

So I have a little potty chair for my son that he uses to go poop on. He will not use the big toilet for poop. How do I transition him to use the big toilet ? I am scared to fully take it away and then I have a toddler who is regressing potty training.