try a squirt (1ml) of mylanta cherry supreme.
mylanta is adult meds, but safe even for a newborn.
we all say mylanta cherry supreme bcse this particular kind doesn’t have any aluminum.
it might be hard to find, and some have had success finding a generic store brand version, making sure to read the ingredients and find the variety w/o the aluminum.
you can give in 1ml increments, up to 5ml a day. if you see loose stools ‘just’ back off.