A 2 year old can eat just about anything for breakfast but a healthy breakfast for a 2 year old is a small bowl of cereal with milk.
Also a cup of milk or natural juice such as apple juice, pear juice etc.
You can also feed your 2 year old child some fruits such as banana, cantaloupe, or strawberries and any other healthy fruits that your 2 year old child likes.
A peanut butter and Jelly Sandwich or some toast is also a good healthy breakfast that most 2 year olds like.
A small bowl of oatmeal would also be a good breakfast idea for a 2 year old.
Basically anything the 2 year old child can easily eat would be good.
A 2 year old may not eat a whole lot so give them small portions of each food.