This is the combination of the Sims 4 (debug) Water Pump and the Sims 3 Store Never Spill Bucket.
It only has the options to give a toddler a bath or a bubble bath.
Bubbles will extend outside of the tub when using the bubble bath option,
If you wish to make a toddler tub, feel free to rip my tuning out and slap in your package. (I don't guarantee that mine was done *correctly* but it seems to work so far in testing.)