I have the dream on me travel bassinet next to my bedside. Its nice and large and comfortable, my baby loves it. But it has a seem in the middle where the mattress folds and she gets so uncomfortable when she ends up on it. I have to scooch her so that her butt on on or above that seam but shes starting to get too big

Has anyone had this bassinet and gotten a different mattress that fits into it? The brand doesnt seem to make separate mattress pads for the bassinet