My daughter is 48 days old and she is having temperature of 99 and sometimes 99.2f when measured under armpi. It's is like this when she is 7 days old. I delivered her at 38 weeks. We asked pediatrician they it was ok as my baby is active and taking breastfeed. But she is unable/ struggling to sleep when the temperature is 98.5f above. And we missed NST. Is it worry as any other underlying cause. Please suggest are there any further diagnosis/ tests required to rule out.