How much, and how often?

“The average amount of formula that babies take per feeding is:
Newborn: 1-2 ounces (30-60 mL) per feeding
1 month old: 3-4 ounces (90-120 mL) per feeding
2 months old: 5 ounces (150 mL) per feeding
4 months old: 6 ounces (180 mL) per feeding
6 months old: 7-8 ounces (210-240 mL) per feeding
The amount can vary depending on the baby's weight and if the baby is going through a growth spurt.” AAP KidsDoc (Barton Schmitt, MD)

“Most newborns will eat every 2 to 3 hours, but your baby's pattern may vary (and be perfectly healthy). For the first 2 days, your baby might take in just a half-ounce per feeding, moving up to 1-2 ounces after that.” American Academy of Pediatrics

“If bottle-fed, most newborns eat every 2 to 3 hours; 8 times is generally recommended as the minimum every 24 hours. Babies might only take in half ounce per feeding for the first day or two of life, but after that will usually drink 1 to 2 ounces at each feeding.” American Academy of Pediatrics

“By the end of the first month, most babies consume at least 3 or 4 ounces per feeding, about every 3 to 4 hours. By 6 months old, they may take in 6 to 8 ounces at each of 4 or 5 feedings in 24 hours.” American Academy of Pediatrics

“From birth to 3 months of age, feed every 2 to 3 hours.
From 3 to 9 months of age, feed every 3 to 4 hours.
Infants often set their own schedule by 1 to 2 months of age.” AAP KidsDoc (Barton Schmitt, MD)

“The most amount of formula advised per day is 32 ounces (1 liter). ... Feedings shouldn't take more than 20 minutes.” AAP KidsDoc (Barton Schmitt, MD)

“It's a very concentrated food, so your baby will only need a small amount, about a teaspoonful, at each feed.” NHS

“At birth, your baby's tummy is no bigger than a toy marble (about 1 to 2 teaspoons). By day 10, your baby's stomach grows to the size of a ping-pong ball (about 2 ounces).” USDA WIC Breastfeeding Support

“Breastfed newborns usually nurse every 2 hours from the start of the feeding to the next feeding so 10-12 sessions in 24 hours is the norm. Over time the feedings space out but this is a slow process.” American Academy of Pediatrics

“How Often to Feed to Bring in the Milk Supply:
Every 1½ to 3 hours for the first month (8 to 12 times per day).” AAP KidsDoc (Barton Schmitt, MD)

“Nurse 10 minutes on the first breast. Then, nurse up to 15 minutes on second breast if your baby is actively sucking. ... Length of Feedings After Milk Supply is in: (by day 8 at the latest)
On the first breast, allow your baby to nurse up to 20 minutes. Reason: to get the high-fat, calorie-rich hind milk.” AAP KidsDoc (Barton Schmitt, MD)

“You should feed your baby between 8-12 times within 24 hours. There is no set time for feedings. They may be 15-20 minutes per breast. They may be shorter or longer.” USDA WIC Breastfeeding Support

“In the first week, your baby may want to feed very often. It could be every 1 to 3 hours in the first few days. Feed your baby as often as they want and for as long as they want. They'll begin to have fewer, but longer feeds after a few days. As a very rough guide, your baby should feed at least 8 to 12 times, or more, every 24 hours during the first few weeks.” NHS

“Every baby is different. Some babies want frequent short feeds, and others prefer feeding for longer, or a mixture of both. Let your baby finish the first breast, then offer the second.” NHS

“In the first few weeks, babies need to be breastfed 8 to 12 times over a 24-hour period. Let your baby set the pace. ... Feed your baby from each breast for as long as she wants and alternate the breast you begin with at each feeding.” Canadian Paediatric Society

“Most newborns feed every 2-3 hours, and they have around 8-12 feeds every 24 hours. ... Sometimes feeds might last up to an hour, especially if your baby is breastfeeding.” Raising Children Network

“Most breastfed infants take 1 oz in the first few weeks, an amount that slowly increases over time. It tops out at rougly 4.5 oz at a year of age.” American Academy of Pediatrics