Question:
It's my husband b-day in the 9 days my I buy a present and what kind of b-day party my I do?
Answer:
Mazal Tov. May you and your husband live ad meah v'esrim.
Regarding your husband’s birthday, we should not make birthday parties during the nine days, as it is not a time for parties. You can ask you husband for a yearly rain check, on the birthday party, and IY"H next year you will be able to celebrate it with moshiach tzidkaynu.
Regarding giving him a birthday present, please see the following post https://dinonline.org/2017/07/18/present-during-the-3-weeks/
Sources:
Kovetz Halachos ( R. S. Kaminetzsky shlit"a) Bein Hamitzarim 10-8.
