This is what we were told my Ds2 had,, he spent a night in hospital at 7 weeks and had a barium test done and this is what they said.. I was expressing full time but you can use this product for Bf as well. Karicare thickener.. it has instructions on the back for how to use when Bf or bottle feeding..

(ps it made him sleep through the night to as its thick and made his tummy full)