I had the same problem with Bailey

, so I started keeping a log of when she pooped! As it turned out she'd go 20-30 minutes after a meal. She was about 9 mos old then.
FYI when I take the girls out for potty I always say
"Hurry up" after I set them in the grass, (or snow).

This has been working for us.
Kathy

Maggie

& Bailey