New-parent mistake No. 5: Not sweating a fever in a newborn

Any fever over 100.4 rectally in the first three months of a baby's life is an emergency,” Walker says. The one exception is a fever that develops within 24 hours after an infant's first set of immunizations. Walker Tells WebMD, "Some parents may just say 'he feels warm' and give the baby Tylenol. But that's a parenting mistake in this age group. An infant's immune system is not set up to handle an infection on its own."