An age-appropriate diet is one that provides adequate nutrition, is appropriate for a child's state of development, and can help prevent childhood obesity.
At 4 - 6 months of age an infant should be consuming 28 - 45 ounces of formula
Starting solids too soon may cause the infant to choke if they are not physically ready
Development to indicate an infant is ready to eat solid foods:
The birth weight has doubled
The baby has good control of head and neck
The baby can sit up with some support
Whole milk may replace breast milk or formula
One year olds should be getting much of their nutrients from:
Fruits and vegetables Breads and grains Dairy group
After the age of two, it is recommended that the diets be:
Moderately low in fat
Variety of foods from each
food group
Provide nutrient dense foods
Put the plan into action by:

Providing healthy eating habits
Serve small portions Choose healthy snacks Beverages count too!
Limit the amount of empty calories
Use smaller bowls, plates, and utensils for your child to eat with
Don't insist that children finish all the food on their plate
Teach them to take small amounts at first