Yes, you can give your 16-month-old baby Oragel for teething pain, but it is not recommended as the first choice. It is suggested to use acetaminophen or ibuprofen for pain relief. Non-pharmacological measures such as a cold teething ring or a clean washcloth soaked in cold water can also help. If there are any unusual symptoms like a blue blister on the gum, it is best to consult a dentist.