Nutrition in infants is very easy. Under the age of six months, an infant needs nothing but breast milk or formula. Once the child has reached six months old, pediatricians recommend that you introduce solid foods. This is more for acceptance than nutrition, as breast milk and formula has all the nutrition that an infant needs in the first year of life.
If you normally use cream cheese or butter as a spread for some food items, you should think about using a healthier option. Butter and cream cheese are not very healthy. Peanut butter or almond butter can be good replacements for cream cheese and butter. Peanut butter and almond butter are healthier and are just as flavorful.
Stay away from junk food to help keep yourself healthy. Foods with high carbohydrate content (i.e. starches, sugars, and flour) and no other nutritional value, greasy fried foods, and heavily processed foods are all to be avoided.