A girl can begin feeding her baby milk (breast milk or formula) from birth. However, she shouldn't give her baby cow's milk until after one year of age.
Understanding Infant Nutrition
Breast milk or formula is the primary source of nutrition for infants for approximately the first year of life. [Several sources](https://www.mottchildren.org/posts/your-child/feeding-your-baby-toddler, https://www.betterhealth.vic.gov.au/health/healthyliving/breastfeeding-deciding-when-to-stop, https://www.healthychildren.org/English/ages-stages/baby/formula-feeding/Pages/Why-Formula-Instead-of-Cows-Milk.aspx) confirm this recommendation. Cow's milk lacks essential nutrients for babies under one year old.
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Breastfeeding: Breastfeeding is recommended for at least the first six months of life, and ideally, it should continue for up to a year or longer, as mutually desired by mother and child. (https://www.mottchildren.org/posts/your-child/feeding-your-baby-toddler, https://www.cdc.gov/breastfeeding/php/faq/faq.html)
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Formula Feeding: If breastfeeding isn't possible, infant formula provides a suitable alternative. (https://www.healthychildren.org/English/ages-stages/baby/formula-feeding/Pages/Why-Formula-Instead-of-Cows-Milk.aspx)
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Solid Foods: Solid foods are generally not introduced before four months of age, as breast milk or formula provides all necessary nutrients during this period. (https://www.hopkinsmedicine.org/health/wellness-and-prevention/feeding-guide-for-the-first-year, https://www.unicef.org/parenting/food-nutrition/feeding-your-baby-when-to-start-solid-foods)
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Cow's Milk: Cow's milk is not appropriate for infants under one year. It lacks crucial nutrients and can be difficult for their digestive systems. (https://www.healthychildren.org/English/ages-stages/baby/formula-feeding/Pages/Why-Formula-Instead-of-Cows-Milk.aspx)
