The only other thing I can think of is giving some small bottles of cooled boiled water in the meantime to help soften things up. Matilda went on some medications that caused constipation at 6 weeks even though she was breastfed & we would give 50mls with 1/4 tsp of brown sugar & that helped move things along as well. But she would go an entire day without having a poo. Good luck!