Those born in the year of the monkey are said to be crafty, clever and charming. That has spurred some couples in China to delay parenthood until the less-auspicious sheep year ends — a balm for companies offering fertility products and obstetric services.

The change in the Chinese zodiac from sheep to monkey, which happens this year on Feb. 8, has helped boost maternity bookings by as much as 30 percent at Harmonicare Medical Holdings Ltd.'s 72-bed hospital in Beijing, the company said. German drugmaker Merck KGaA said sales of fertility-related medications increased in China late last year as couples sought to build the ranks of little monkeys.

Harmonicare, China's largest private obstetrics and gynecology hospital group, is renovating wards in its Beijing and Wuhan centers, adding beds and hiring medical staff on expectation of a busier year. It expects the advent of the country's two-child policy will add to a monkey-baby drive.