The present study investigated the variation in sow posture change and piglet crushing, as explained by the variation in ambient temperature (T), measured at the sow level within 48 h post-partum. As the T increased to 26°C, frequency of sow posture change decreased, as well as the frequency of changing form standing to lying laterally (ST-LL), which contributed to a reduction in piglet crushing. This work demonstrated the importance of T control in farrowing rooms to reduce piglet crushing.