Do you want this to be a big reno? meaning, will you replace things totally or do you want to work with what you have mostly? will you add a toilet to the bathroom? if you replace the vanity, you can put in a larger one curving around the corner with a medicine cabinet above. If you replace the shower with one flat on the ground, you can also put in clear doors for bigger visual space. how about re-painting as well

A 3x3 shower is too big. Definitely less intimate. I like the second plan! What did you decide to do?

I understand your need to bathe your little people but I would not change a thing in this bathroom. What I would do is find a bathing station that could be placed in the shower temporarily until your little folks are no longer little, By the way, bath tubs regardless of the lovely ads that show sumptuous bathing areas as components of enormous and well appointed master bedrooms, are passe. A great idea 150 years ago and for the most part the only reasonable and effective solution. Today, bathing in most homes happens very infrequently and adding a tub to your space would be the tail wagging the dog. Keep the nice space you have created and add a temporary bathing solution. Best of luck with your project! If you enjoy any of my commentary please click on my Pro-Page link on the left and then click "follow". Regards. M

Congrats on your soon to be 7th family member and a new home. Although i don't deal with home layout I'm all about the kitchen benchtop so when you come down to colour choice in your kitchen and what benchtop to choose I can definitely be of help. Happy building.