How do I get my 6-month-old daughter to eat on a three-to-four-hour schedule?

How do I get my 6-month-old daughter to eat on a three-to-four-hour schedule? I'm feeding her bland, pureed solid foods, and half formula/half semi-skimmed milk (7 to 8 ounces).

First of all, I would cut out the cow's milk. Babies need breast milk or formula until 1 year of age to make sure they get all the vitamins they need while they are merely sampling solid foods. Cow's milk contains more salt and protein than breast milk or formula, which puts a strain on little kidneys. It's also low in iron. As your baby eats more solids, the quantity of formula should gradually decrease from about 32 ounces a day at 6 months to only 16 ounces at 1 year of age. It's possible the formula/milk mixture isn't quite as filling as all formula. Most feeding experts say the parent is responsible for what, when and where the baby eats, but the child is responsible for whether and how much. Schedules vary from baby to baby and from day to day. Your goal, now that your baby is 6 months old, is to slowly increase the quantity of the solid foods per serving, and to try one new food at a time. Use feeding to assuage hunger and not other needs. It's easy for babies to get distracted during feeds at this age by all that's going on around them. Make sure she's really finished when she signals an end to a meal and not just interested in something else. When she starts becoming restless, make sure it's food that she really wants and not some attention or help reaching a toy.