I don't know if it's ideal but a friend of mine shared that she would clean her baby's mouth and teeth when baby is napping. She'd wait till baby's last few minutes of nap time and do the necessary. That way, if baby wakes up, atleast baby would have had almost sufficient sleep. She also trims her baby's nails when baby is napping. Hahaha. She says that doing these "arduous" tasks are much more easier when baby is not awake.
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Mother of 1 fun loving princess