EBF baby constipated after starting solids?

I started my baby on solids about 3 weeks ago, I make it myself and it’s mostly just been fruits and veggies. Avacado, peach, sweet potato, pear, banana, spinach, apple, etc. I’ve given him steel cut organic oats and lentils once each.

Before solids he would poop every few days and it was pretty liquidy. The last week he’s been grunting to poop and sometimes crying and it’s been a play dough consistency. He’s going almost every day but I’m worried he’s constipated.

I’ve fed him peaches, peas, pear to help but nothing has changed. I’ve been breastfeeding him as much as I can but it hasn’t helped either.

Has anyone else experienced this? Did anything help?

I’ve wanted to avoid baby cereals that are processed and have preservatives but if it will help I’ll give it to him