Mr Museveni’s spokesman said the president would not sign the law until he had received the scientific advice.
Last week he said he had decided to sign the Anti-Homosexuality Bill, which parliament has passed.
The US – one of Uganda’s largest aid donors – has warned that enacting the bill would complicate relations.
President Barack Obama described it as an affront, and a danger to, Uganda’s gay community.
Read more at bbc.co.uk