Butter can provide calories and fat, which are essential for infants' growth and brain development, but it offers little in the way of vitamins or essential fatty acids compared with other sources. There is no evidence that butter improves sleep in babies. For infants under one year, small amounts of unsalted butter may be added to foods, but it should remain minimal because excessive saturated fat can displace more nutrient dense foods and may contribute to unhealthy weight gain. The type of butter matters primarily in terms of salt content—unsalted is safest—and organic or grass fed options may contain slightly more fat soluble vitamins, though the difference is modest. Healthier fat sources for babies include breast milk, formula, avocado, full fat yogurt, nut butters (for older infants), and olive or canola oil once solids are introduced. Parents should remember that butter is an occasional additive, not a necessary staple, and focus on providing a variety of healthy fats to support growth and development.