"Pamiętaj o urodzinach mamy."

Translation: Remember about mom's birthday.

[Thom475609]

Remember mom's birthday should be good, too.

[Jellei]

Yes, it works.

[immerweiter]

remember your mom's birthday

[Jellei]

Added versions with "your", which were not accepted so far.

[peter138415]

I thought mamy meant, We have and yet here it means, mum's. Why

[Jellei]

It's Genitive of "mama" here. "have" doesn't suit this sentene at all ;)

[one_half_3544]

is 'o' the only preposition that could be used here? I mean, shouldn't there also be 'ob' (like in Russian) in order to avoid awkward vowel combination here. (Like, for example, 'w krakowie', but 'we wrocławiu').

[Jellei]

There is no alternative option for "o". Even if it's preceding another "o". It's pretty pronouncable: Rozmawiamy o Oli, pamiętamy o oknach... no problem here. You can make it a long 'o', you could make some pause as well.

[akikotsukamoto]

My answer "remember about mom's birthdays " is wrong?

[Jellei]

Well... it's quite unusual to use "birthdays" in plural like that.