My child is 23 months old. Previously, they used to breastfeed before sleep and upon waking up from sleep. However, for the past 15 days or so, their behavior has changed. They now refuse breastfeeding at night and cry for their grandmother. They only calm down and fall asleep when in their grandmother's arms. Interestingly, during their afternoon nap, they still breastfeed without any issues. We are really puzzled and seeking for help.