Introducing foods at what age?

Tahisha
My LO just turned 15 weeks today. Started on 1oz of puréed apples. So far he's tried apples, pears and green beans. I have him 3 days on each before trying a new one.
 I just gave him baby oatmeal mixed with his milk and pears last night. He ate about 3-4 of the baby spoonfuls and fell fast asleep. I think I will give him oatmeal at night and milk during the day with about 1/2 oz of fruit in the morning. I was really surprised at how much the oatmeal kept him sleeping comfortably. This may help me in training him for bedtime.