This paper constructs a neoclassical growth model to discuss the relationship between hours worked (labor supply) and fertility rate. We find that under some reasonable parameter spaces these two variables are negative correlated which is also in line with the result of the empirical literatures. In the model, the setting of the household’s utility function originates from the spirit of Becker and Barro (1988) and Barro and Becker (1989) with labor supply. We also follow Barro and Sala-i-Martin (2004) to assume that the cost of child-rearing is increasing with capital.