Sleeping longer stretches

M

My almost 6 week old (tomorrow!) has started sleeping 5-6 hours at night. Typical eating about 2-3am then back down again until 6-7am. In the morning she eats a ton. She was doing 4oz every 3uish hours. Now she wants to eat every 90 minutes to 2 hours! Usually 2-3oz.

Normal? Anyone else? She is bottle fed breast milk.