Your 18-month-old son has been sleeping through the night for the past two months.You and your spouse were very happy with this new development and were looking forward to many more months of it.But he has started waking up at night again and has been pretty fussy during the day.What is the likely reason that he is waking up now?

Question

Quizplus · Accepted Answer

The most likely reason for an 18-month-old to start waking up at night and being fussy during the day after previously sleeping through the night is teething. The molars typically come in between 13-19 months and can cause discomfort and disrupted sleep. The other options (drinking too much, eating too much, and going through a growth spurt) are less likely to be the cause of sudden nighttime waking.

Your 18-Month-Old Son Has Been Sleeping Through the Night for the Past