Children develop expectations of caregivers' support-giving during early-life interactions. The present study examined whether caregivers' responsiveness would influence young children's expectations of caregivers' support-giving behavior and willingness under different situational stress levels. We manipulated the caregivers' responsiveness and situational stress levels. Children were tested to determine their expectations of caregivers' support-giving behavior and willingness. Sixty-four (33 boys, M[subscript age] = 5.34) and 68 (34 boys, M[subscript age] = 5.25) Chinese Han children from a city in Southeast China participated in Studies 1 and 2, respectively. In Study 1, we created a separation condition (i.e., a moderate level of stress) and found that children's expectations of caregivers' support-giving behavior and willingness were significantly lower in the unresponsive condition than in the responsive condition. The expectations in the unresponsive condition decreased significantly compared with the initial expectations. In Study 2, we created a danger condition (i.e., a high level of stress) and found that caregivers' responsiveness had no significant effect on children's expectations of caregivers' support-giving behavior and willingness. These results imply that both caregivers' responsiveness and situational stress levels affect children's expectations of caregivers' support-giving. They further suggest that children aged 4-6 can simultaneously assess caregivers' responsiveness and situational stress levels while forming support-giving expectations.