A 5-day-old baby typically eats 1 to 2 ounces per feeding, whether breast milk or formula. At this age, feedings happen frequently, around 8 to 12 times in 24 hours, so the total daily intake adds up even though each session is small.
Why Feedings Are So Small at 5 Days
A newborn’s stomach grows rapidly in the first week of life. Around day 3, it holds roughly 22 to 27 milliliters (less than an ounce). By one week, it expands to about 45 to 60 milliliters, or 1.5 to 2 ounces, roughly the size of an apricot. At 5 days old, your baby’s stomach is somewhere in between those two milestones, which is why 1 to 2 ounces per feeding is the right range. Trying to push more than that can cause spitting up or discomfort because the stomach simply can’t hold it yet.
Formula-Fed Babies at 5 Days
The CDC recommends offering 1 to 2 ounces of formula every 2 to 3 hours in the first days of life, with most newborns eating 8 to 12 times in a 24-hour period. That works out to roughly 8 to 24 ounces total per day, though most 5-day-olds land somewhere in the middle of that range. Let your baby set the pace. Offer the bottle, watch for signs they’re done, and don’t worry about finishing every last drop.
Some babies cluster their feedings closer together during parts of the day and go slightly longer stretches at other times. Both patterns are normal as long as the total number of feedings stays in that 8-to-12 range.
Breastfed Babies at 5 Days
Breastfed newborns eat on a similar schedule: 8 to 12 times in 24 hours, or roughly every 1 to 3 hours. Measuring exact ounces is harder when nursing, but you don’t need to. Your body is transitioning from colostrum (the thick, concentrated first milk) to mature breast milk between days 2 and 5 after delivery. You may notice your breasts feel fuller and warmer, and the milk gradually shifts from yellowish to a bluish-white color.
This transition means your supply is increasing to match your baby’s growing stomach. The best way to support that process is to nurse frequently and let your baby feed until they pull away on their own. A single nursing session can last anywhere from 10 to 20 minutes per breast at this stage, though some babies are faster and some are slower.
Hunger and Fullness Cues to Watch For
Rather than watching the clock, it helps to learn your baby’s signals. Early hunger cues include fists moving toward the mouth, head turning as if searching for the breast, lip smacking, sucking on hands, and becoming more alert and active. Crying is actually a late hunger cue, so try to offer a feeding before your baby gets to that point. A calm baby latches and feeds more effectively than one who is already upset.
When your baby is full, they’ll typically release the breast or bottle nipple, turn their head away, relax their body, and open their fists. These signs mean the feeding is done. Trying to continue past these signals can lead to overfeeding and discomfort, especially with bottle-fed babies who may passively swallow milk that drips from the nipple.
How to Tell Your Baby Is Getting Enough
Diaper output is the most reliable day-to-day indicator. By day 5, a well-fed newborn produces at least 6 wet diapers in 24 hours. The number of dirty diapers varies more from baby to baby, but you should be seeing some. Wet diapers should feel heavy, and urine should be pale yellow or clear, not dark or concentrated.
Weight is the other key measure. Most newborns lose up to 7 to 10 percent of their birth weight in the first few days, then start gaining it back around days 4 to 5. Your pediatrician will check weight at the first office visit (usually within a few days of leaving the hospital) and can confirm whether feeding is on track.
Signs Your Baby May Not Be Eating Enough
A few warning signs suggest a 5-day-old isn’t getting adequate nutrition or fluids. Fewer wet diapers than expected is the most common early signal. Other signs of dehydration include a sunken soft spot on top of the head, sunken eyes, few or no tears when crying, and unusual drowsiness or irritability. If your baby is difficult to wake for feedings, seems increasingly sleepy, or their skin feels cold or looks unusually pale or blotchy, seek medical attention promptly. These signs can escalate quickly in a newborn because their reserves are so small.