Normal change in behavior means showing sympathy, offering help, expressing their feelings on the situation and talking about the other parent more often. (marriage.com)
This is particularly the case if there is compromised blood flow from a medical condition, or just from normal changes that accompany aging. (mindbodygreen.com)
Guys and girls will also notice other body changes as they enter puberty, and they're all normal changes. (kidshealth.org)