I have been looking into methods of preventing sudden infant death syndrome (SIDS) due to overheating during the current heatwave and from reading an article from MedicalNewsToday, Armstrong, (2020) states,
Crying can make a baby feel hot, causing them to sweat. This effect is more common when a baby cries very hard or for a long period. Some research [(Harpin & Rutter 1982)] suggests that babies may sweat on their palms and feet when they are upset. Parents and caregivers may notice this sweating even after a baby stops crying.
What is the cause of babies getting hot when crying while older children and adults don't?
Armstrong, M. (2020). What does it mean when a baby sweats? MedicalNewsToday https://www.medicalnewstoday.com/articles/baby-sweating
Harpin, V. A., & Rutter, N. (1982). Development of emotional sweating in the newborn infant. Archives of Disease in Childhood, 57(9), 691-695. http://doi.org/10.1136/adc.57.9.691