How old is your little one?
In the early stages of feeding solids, look upon the introducing solids as part of the A time. So breast/ bottle first, then about an hour later a little solids and then after that the sleep.
The milk needs to remain the main source of nutrition until around 9-12 months when the balance can shift a bit. Take it slowly to 3 meals, you don't need to go from nothing to 3 meals. solids may not actually make that much of a difference to sleeping I'm afraid, there won't be siginificant amounts of calories in pear puree and rice to make a vast difference (hence why milk is more impt as its more calories rich).
A