M.G.
My kids have milk intolerance .... I'm not sure what the difference is between that and sensitivity. They are not allergic. They can't break down the lactose. We just give them regular dairy milk that is lactose free - it works fine for us. I have not tried the other kinds - did not need to. So not sure if that helps or not.
I have breakthrough bleeding around ovulation. It's quite common if you are on birth control medication. Some women get it every cycle, some now and then, and others not at all. If it's heavy or painful, consult your doctor.
We used an Aveno toddler SPF lotion that was good for sensitive skin. I also use the one for babies by Coppertone. I just make sure the SPF is high and still dress them in long sleeves, but light material whenever I can and hats. Mine are fair.
Good luck :)