So sorry for your loss, what you said changes things, and actually that is why i do not like when people sell tadpoles. The first a while is critical for baby frogs, their mortality could be very high at that time and dependant on so many things, such as health and husbandry of parents, water quality, temperature and nutrition of tads throughout all stages, stress levels and care for newly morphed babies. Survival rate is never 100% even in very experienced hobbyists, but could be close. It is very sad experience, but please take it as educational experience, and next time get a well established frogs from reputable place. Milks are awesome frogs!