Newborns are best when photographed within the first two weeks(5-14days).
1 or 2 days later should be ok. But it might take more time for the session, cause the baby will be easily waked up.
The newborn session lasts 3 to 4 hours, and some babies may take a bit longer to settle.
During the session, parents need to ensure that your baby (or babies) has a ready supply of milk, diapers, and cuddles for when your little one(s) needs them.