Mean (±SEM) number of choices to saturated (A; 100 PPM) and diluted (B; 10 PPM) odorants during Y-maze testing of approach/avoidance across early development. Approach and avoidance responses to odorants remained relatively stable throughout development. Male odor consistently elicited the most avoidance and maternal odor consistently elicited the most approach across development. The response to maternal and male odor is plotted in both saturated and 10 PPM odorant graphs to allow comparison. Groups that share a common alphabetic label are not significantly different from each other within each age only based on post hoc tests (p < 0.05, n = 6–8 for all groups). *Significant difference from same odor at PN7 based on post hoc tests (p < 0.05), ∧significant difference from same odor at PN14 based on post hoc tests (p < 0.05).