The current thesis reports on the influence of sex and socioeconomic factors on infant development at two months of age. A total of 120 families participated in the study. Data were analyzed for 85 infants whose caregivers had completed the 2-month-old Ages and Stages Questionnaire 3 (ASQ-3). Independent samples t-tests revealed no significant differences between males and females for the ASQ-3 total scores or the domains it assesses: communication, gross motor, fine motor, problem-solving, and personal-social.Significant correlations were found between income and problem-solving scores (r = -0.225), perceived SES (socioeconomic status) and fine motor scores (r= -0.336), and perceived SES and total ASQ scores (r= -0.259). Surprisingly, the infants whose families had higher incomes or higher perceived socio-economic status scored lower on specific domains of the ASQ-3. These findings are discussed relative to contemporary literature on the range of factors known to influence infant motor and psychological development.