Connections of superstar sprinter Black Caviar have asked not to know the sex of her first foal due in late September.
Black Caviar was retired last year after notching her 25th win in the TJ Smith Stakes and was served by Darley stallion Exceed And Excel in the spring.
Part-owner Neil Werrett said Black Caviar's first pregnancy had progressed well at a stud at Scone in the Hunter Valley.
"She's going really well. All her scans have been positive and it's all looking good so far," Werrett said.
"We don't know what the sex is and we asked not to know either.