For Amaka Okoli, a modern-minded businesswoman living in urban Nigeria with her loving husband Nonso and their daughter, the sex of the baby she’s expecting is irrelevant.

The same can’t be said of her mother-in-law who, in accordance with Nigerian Igbo culture, is desperate for her son to have a male heir and is trying to persuade him to take a second wife, in spite of his reluctance and Amaka’s open opposition.

Amaka is the protagonist of “B for Boy”, the first feature film by Nigerian director Chika Anadu, which was screened at this year’sLondon Film Festival. It is a courageous tale of being a woman and a mother in contemporary Nigeria and of the social pressure that is still put on women to produce a male child.

It’s a movie filled with witty lines and a pungent humour that make its tragic ending a surprise.

From the embarrassing scene at the breakfast table in Amaka’s home, when Nonso’s mother brings in the girl she wants to become her son’s second wife, to the heart-wrenching moment when Amaka is attacked by the women of her husband’s village, who despise her for not letting him take a second wife, the film draws a stark line between modernity and cultural traditions that are hard to circumvent.