S.B.
I understand your need and concerns with schools in our area.
I did research myself and I was comfortable with La Petite Academy. They do have many locations (1 in Chula Vista off east J st and another in Bonita off H st).
They have classes all the way to pre-k. They do except children in diapers and offer assistance with training throughout the day. They offer a trial day. I recommend visiting this school. Very clean and safe!
this is the number for the location on J st ###-###-####
Also I am aware of Kindercare on Telegraph Canyon in Chula Vista. I would recommend them second to La Petite.
I hope you get a chance to review this school and enjoy it. Good luck mom = )