Develop heart-healthy eating habits from the start. Breastfeed for the first year and transition to other nutrient sources between four to six months. Wait until a baby is at least six months old to offer juice, then limit it to 4 to 6 ounces per day. Avoid overfeeding or forcing a baby to finish meals if he or she isn't hungry. Repeatedly give healthful foods, even if he or she initially won't eat them. And avoid introducing foods without overall nutritional value, just to provide calories.