I've still got issues with my ears, 4months after having DS.

After seeing an ENT, he explained it's quite common, due to fluid that is retained during pregnancy. For some of us, that includes in the ears and makes them blocked.

You can get them drained by the GP, as an option.

I'm potentially going to need grommets (yep, what they put into kids ears) if they don't start "draining" themselves soon

Good luck!