Newborns wake every 2-4 hours to feed, and there's no way to fully prevent the sleep fragmentation that comes with it in the first months. The goal for new parents isn't uninterrupted sleep — it's protecting the sleep quality of the hours you do get.
Splitting night shifts with a partner, where possible, so each of you gets at least one solid block of 4+ hours, produces better next-day functioning than both of you being woken by every feed.
Nap when the baby naps really is sound advice in the first weeks — sleep debt compounds, and short daytime naps (even 20 minutes) measurably reduce it, despite feeling unproductive.
Once feeds space out (usually by 3-4 months), reintroducing a consistent wake time and wind-down routine — for yourself, not just the baby — helps your own body clock recover faster than letting your schedule stay fully reactive.
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