Newborn Expected Milk Intake Calculator
This calculator gives an educational estimate of a newborn's expected daily milk intake from body weight, using the common weight-based guide of around 150 millilitres per kilogram per day. Both the per-kilogram rate and the number of feeds per day are editable so you can match the guidance from your pediatrician, midwife, or lactation consultant. It then divides the daily total across feeds to show an approximate volume per feed. This is a rough planning estimate only and not a substitute for professional feeding advice.
Milk intake formula
Daily intake (mL) = weight (kg) * rate (mL/kg/day)
Per feed (mL) = daily intake / feeds per day
Fluid ounces = millilitres / 29.5735
One US fluid ounce equals 29.5735 millilitres. The per-kilogram rate and feeds per day are editable defaults; change them to match the figures your healthcare provider gives you.
Worked example
For a 3.5 kg newborn at 150 mL/kg/day across 8 feeds:
- Daily intake = 3.5 * 150 = 525.00 mL/day (about 17.75 fl oz).
- Per feed = 525 / 8 = 65.63 mL (about 2.22 fl oz).
Newborn milk intake: frequently asked questions
How much milk does a newborn need per day?
A widely used educational guide for full-term newborns is roughly 150 millilitres of milk per kilogram of body weight per day once feeding is established (commonly cited as a range of about 120 to 200 mL/kg/day). Actual needs vary by baby, age in days, and whether breastfeeding or formula feeding. This calculator uses an editable per-kg rate so you can match your provider's advice.
How is intake per feed calculated?
Total daily intake is divided by the number of feeds in a day. For example, an estimated 600 mL per day across 8 feeds is about 75 mL per feed. Newborns typically feed 8 to 12 times in 24 hours, especially in the early weeks.
Is this calculator medical advice?
No. It is an educational estimate. Newborn feeding should be guided by your pediatrician, midwife, or lactation consultant, who account for weight gain, wet nappies, and individual circumstances. Breastfed babies in particular are usually fed on demand rather than to a fixed millilitre target.
Why is the per-kilogram rate editable?
Because published guidance is a range, not a single fixed number, and it changes with the baby's age and feeding method. Rather than hardcode one figure as if it were universally correct, we provide a common default of 150 mL/kg/day that you can adjust to the figure your healthcare provider recommends.
Official sources
- U.S. National Library of Medicine, MedlinePlus: Infant and Newborn Care.
- Centers for Disease Control and Prevention: Infant and Toddler Nutrition.
Reviewed by the CalculatorHub team, edited by James Graham, 19 June 2026. See our methodology.