...here's a link that you may find helpful about why delaying solids until 6 months is now recommended. This is a good website in general, even if you don't plan to make your own baby food.
https://www.wholesomebabyfood.com/early-solid-food-feeding.htm
and more info here:
Re: In honor of all the solids talk...
Alot of moms I've talked to, including DD's pedi, said she'll let us know when she's ready. I'm going to follow her cues (staring us down at the dinner table, making chewing motions when we do, etc.) and that's when I'll start her on solids, whether it's at 4 months or 6 months.