If anyone in your family has a peanut allergy, even a very mild one, it might be best to wait before you give peanut butter to your child. A child who comes from a family where there is a peanut allergy will need to have allergy testing done before you offer up a bit of peanut butter for them to eat.
Relaxation techniques are skills, and like other skills, they need practice. People who use relaxation techniques frequently are more likely to benefit from them. Regular, frequent practice is particularly important if you're using relaxation techniques to help manage a chronic health problem. Continuing use of relaxation techniques is more effective than short-term use.
Meditation is a practice where an individual trains the mind or induces a mode of consciousness, either to realize some benefit or for the mind to simply acknowledge its content without becoming identified with that content, or as an end in itself.