Swaddling does relax the baby and helps them to sleep better. But sometimes excessive swaddling also increases the tummy heat and causes reflux. Check the temp of the tummy, if it feels too hot just place a cold handkerchief on it. Dip a cloth or small towel in cold water, squeeze dry it to drain the excess water nd place it on the tummy. After one side becomes warm change to the other side. Another option is to break water on the tummy the way I have shown in the video link Take 2 steel bowls. A big bowl with flat base and a small one. Fill the big bowl with cold water and place it on the baby's tummy. Now take some water in the small bowl from the big bowl and pour it back into the big ball. In local language we call it "breaking the water over the tummy". Repeat this process ten to fifteen times and pat dry the tummy if any spillage occurs. This will cool dpwn the temperature pf the tummy instantly. Repeat this 3 to 4 times a day. Refluxes will be reduced considerably. https://youtu.be/8bbtZxBTqF8