she can't loose her toenails randomly, there would have to be some traumatic event or surgical procedure for that. Little ones have thin toenails until age 3-3 1/2. I read this in dr. sears book (love him!). Use a file, rather than clippers...for some reason, prevents breakage and seals the nail. I just got this battery powered file from babies r' us that works GREAT! My 8 month old has the same issue, with in-growns to boot (thanks to mommy, it sucks!). But, filing them seems to work better. Plus, she thinks the vibration feels funny and trusts it more than the clippers (which, she patiently puts up with but has squirmed a few times and I "got her", after which, i got teary and called the nurse...who giggled and said everyone's done it.) To strengthen nails, talk to her doctor. Vitamins in little ones are tricky, their metabolisms are still developing, and she may or may not (I have an MPH, I'm NOT a doctor) be able to absorb Vitamin E. So, even just call and ask the nurses (I always found the older nurses had more tricks up their sleeves).