My DD was born 5 weeks early, currently 6 1/2 weeks old, formula fed due to no milk supply. We are on a loose 3 hour easy routine depending on what time she wakes in the morning. In many ways she's a typical 6 week old but she definitely has a newborn digestive tract and possible reflux. We keep her upright for about 20 minutes after eating and use a crib wedge to help the spit ups. She can currently take 3 oz at each feeding but occasionally wants an extra ounce. However her little tummy can't hold 4 oz so we're trying to work around this. She is currently 8 lb.
We've previously tried the cluster + DF but all that eating just kept her awake and made her OT, so we just do a general 3 hour, 7, 10, 1, 4, 7, 10, 2. She wets plenty of diapers (8-10 a day) and has gained weight well. The past few days she's acted more hungry in the evening and is awake anyway so we may go back to the cluster although we'd just have to drop it again in another week and a half.
We usually feed her between 10-11 pm (fairly fixed time), 2-3:30 am and 6-7:30 am (depending on when she wakes from hunger but never later than 7:30). Although she takes to the "DF" it's not a true dream feed for her as she cannot be asleep for this. If we don't unswaddle her, feed her slowly, burp her and then keep her upright she will spit up quite a bit of her bottle. The unswaddling and burping, of course, ensures she's awake. She also pretty much entirely lost her rooting reflex in NICU so she won't take to the bottle asleep. Is it really that crucial to truly keep her asleep?
Also, any tips to get that little bit of extra food in her tummy that she wants? NICU was forcing 3 oz down her throat on a 4 hour strict schedule at 3 weeks old and she'd of course spit a lot of this up. When we brought her home a week later we switched to 2 oz every 3 hours and it helped her a lot. We slowly bumped up to 3 oz every 3 hours but she's ready for 4 sometimes but her body hasn't caught up yet... but she doesn't really take to clusters! Growl!