This is so hard and so frustrating...I empathize with you.
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Do you have any sense of why he bit you? Or why he headbutted you?
It is the most difficult to do in these moments, but it is always the first thing I try to do...try to identify the child's feelings and needs that are behind the behavior, and reflect them back to him. There is always a feeling and a need (if not more than one) behind a problem behavior (as well as pleasing behaviors). They do not know how to express them in any other way yet but by instinctual, impulsive action (biting, headbutting, spontaneous hugging, etc.). Was he bored, playful, sad or frustrated when he bit you? Do you think he was angry, scared, or playful when he headbutted you? What might he be needing from you at the moment he does those things? These are the questions I ask myself when my son acts out.
I have found that the worse the behavior, the more my son needs me to pour on the love and empathy. I try to match the intensity of my empathy and curiosity to the intensity of feeling I sense he must be having to act out in this way. It tends to neutralize the energy immediately.
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I would suggest doing whatever you can to store up and shore up your emotional energy so that when these things happen, you can harness all of it (because we need every ounce, right?) to refrain from doing what you feel like doing and instead take a few (or many) deep breaths, and as calmly as possible, reflect back to him, "You seem angry or sad about something. What is the matter? Is it...?" Or, "You were curious..." or "...being playful, but biting is not okay. It hurts Mommy. Mommy will have a boo boo if you bite." Then allow him to continue nursing and nonchalantly watch like a hawk for any sign that it might happen again so you can intercept and emotionally check in again.Â
In general, I find that this approach works better with my son than punishments and scolding. It takes repetition, patience, and consistency, but it has made our relationship happier and closer, even despite some "bad days".
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Also, his laughing at the idea of having hurt you is not an indication of a problem because developmentally he is not capable of demonstrating empathy or impulse control in this way. When I've experienced it with my son, I've sensed that it is actually an indication that the emotional tone of the conversation is too intense for him and he is laughing as a way to release the anxiety/stress. I've found that it helps to adjust the intensity and amount of information I share in telling my little one when he is responsible for my pain, discomfort or distress according to his developmental capacities. It won't be until he reaches adulthood that he *fully* understands the impact his behaviors have had on me. Your son will likely stop doing the problem behavior if the need behind the behavior is addressed.
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I read or heard somewhere once, "A met need goes away." It's kind of my parenting mantra and it seems to usually work for me.
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Wishing you some good days.