We had great luck with puddle jumpers.
Small fiberglas boats made by the upstream edge.
My son and daugher were in them from 3 till 7 or 8 then we moved up to evo’s
The glass boats weigh 15 pounds and go really fast in a straight line.
They also go straight easier than short plastic boats.
It all makes a difference if you want to go on a river trip with some flat water. You could probably pick them up for 5-600 bucks.
I didn’t see any pink ones but ours had sparkly paint.
Upper Canada Fiberglass might still make them.
Or just do a search on the web for puddle jumper kayak.
good luck. Paddling with kids can be great. Specially if you have really good boating friends that are willing to help. We did.