How can I improve my baby's appetite? She's 8 months old and it seems that at some days, she eats a lot, but other days, she eats a little.

At your baby's age, it's still acceptable if your baby doesn't eat much because milk should be her primary food until 1 yo. As long as she's healthy and active, no need to force feed your child. It may do more harm than good. If you're really worried, you may consult your kid's pedia.

know you're baby is just fine even if she doesn't eat as always as long as she's drinking milk, active, not lethargic. Observe your baby, perhaps she's still full prior to eating. :)