This is a habit that should last a lifetime, and you can begin instilling it when your child is even in utero!
Properly nourishing your baby in utero will also potentially set the stage for optimum health after birth.
He published at Oxford in 1668 two tracts, on respiration and rickets, and in 1674 these were reprinted, the former in an enlarged and corrected form, with three others "De sal-nitro et spiritu nitro - aereo," "De respiratione foetus in utero et ovo," and "De motu musculari et spiritibus animalibus" as Tractatus quinque medico-physici.
From your description, I'm not sure when the live kitten was born, but the other four might have been dead in utero.
It is possible for a mother cat to pass the virus to her fetuses in utero.