1 month old sleeping for 4 / 4.5 hours at night?

🐧🌻 Erin🍍🦄

So I have been nursing on demand and normally baby will wake me up every 2-3 hours at night and during the day, but lately I noticed she is having one long stretch of sleep that will be 4 /4.5 hours long.

Should I start setting a alarm or is this pretty normal and something to just let be?