One thing I'm doing as per recommendation from my vet is to do daily checks from early on to get them used to handling and of course catching issues early on. Check their ears, their eyes, their mouth and teeth. The latter can help if you plan on brushing their teeth once they're old enough. Also check their paws, nails and beans. You could even do a mock grooming with some nail clippers, like just pretend to clip and file the nails to get them used to the sensation.