Sleeping thru the night

My LO usually drink lesser during the night since 1 month old, 60ml per night feed whereas her morning intake is 120ml. Suddenly, she stopped taking night feeds when she turns 2 months for two to three days, then night feed for 2 days then no more night feeds till now, and she is turning 3 months in 2 weeks. So far no more night feeds unless she doesn't burp during her last feed to sleep through the night.

First time about 4 mo. Fed formula milk that night. Scared me when its day break already when she had not woke up in the night.

I let my Lo sleep by herself. By till date 13 month haven sttn.