Oatmeal cereal in bottle?

Hi all, my baby was born in the 80th percentile but has been dropping percentiles and at 4 months only weighed 13.5 lbs. I read somewhere that mixing oatmeal in breast milk/formula in a bottle can help with weight gain. Any one who has tried this and helped?

Please don’t tell me about choking risk etc, I am aware of it and have the right nipple size as well. Just want to know if anyone tried this and worked for their baby to gain weight.