Constipated baby!

Autumn

We started carrots about 3 weeks ago. We were doing 1x daily and recently within the past 2-3 days moved up to 2x daily m. Ever since this poor boy has had a bard time pooping. We do belly massage and I also put him in his reclining chair cause honestly it’s his pooping chair. Every time he is in it he poops. But he’s been grumpy and uncomfortable. Any suggestions. He’s breastmilk only....