i started giving my 4 month old oatmeal about a week ago, and i've been trying other stuff, i gave her some avacado mixed with breast milk(i've also mixed avacado with formula) and she loved it. i've mixed oatmeal with apples and also bananas. she absolutely loves to eat, she's a pro at it.
just a few bites at first and work your way up. every baby is different so whenever you think is right and if you get discouraged, don't worry. things will work out. you can't stop giving solids after you've started, keep that in mind