Your baby’s palate
Hours after birth, infants can make faces when they experience sweet, bitter, and sour tastes. Babies press their lips together and grimace at a drop of vinegar. By contrast, most newborns will relax their faces and react favorably to a taste of something sweet.
Breastmilk is sweet
For most babies, breastmilk is the first taste sensation they experience, which is a sweet taste.
Your diet changes breastmilk flavor
Breastmilk alone provides most full-term newborns with the nutrition they need for the first months of life, as well as added immune protection. But that's not all—breastmilk also contains the flavors, tastes, and aromas of the foods mom has eaten. If mom likes food heavy in garlic or the taste of vanilla, she will relay these flavors to the baby through her breastmilk. These flavors teach the baby about what the family eats, even before she has a chance to taste them.