Just make baby sit from the front, don't let baby straddle the potty. Easy to let baby sit, who does not want to open legs.

Better posture to potty train with legs closed than the conventional ones on which baby has to open legs to sit.

Step 1 5-6 months and up Potty
Step 2 18 months and up 　 Potty seat with handle
Step 3 24 months and up Potty seat (without handle) + Step