I had a charge who stopped walking. He would take a few steps and fall over. This happened right as the parents left for work. He was also crying way more then normal and acting odd. The parents kept saying he is sad. I knew something was wrong. They left and I just told the little boy 18 months at the time I know something is wrong and we will fix it. He stopped crying . He had a double ear infection, bronchitis and a respiratory infection.
Knowing your charge is critical. I new by his cry it was more then him being sad.