Why Your Child Can Handle It One Day and Completely Lose It the Next | Nervous System Regulation | E451

Trying to find out why your child can handle it one day and completely lose it the next can leave parents confused and frustrated. Learn why nervous system capacity changes—and how to respond differently. Dr. Roseann Capanna-Hodge teaches Regulation First Parenting™ and helps parents understand emotional dysregulation.

If you’ve ever thought, “But you did this yesterday!” you’re not alone. It can be incredibly frustrating when your child seems flexible and capable one day, then melts down over the smallest demand the next.

The key is understanding the difference between having a skill and having access to that skill under stress. In this episode, I share how nervous system capacity changes from day to day—and how parents can respond without personalizing behavior.

Why does my child handle things one day but melt down the next?

Your child’s ability to regulate depends on what their nervous system is carrying right now. A demand that felt manageable yesterday may exceed their available capacity today.

The skill may still be there.Stress can reduce access to that skill.Yesterday’s nervous system isn’t today’s nervous system.

Real-life example: A teenager may get ready for school independently one morning, then have a full explosion when asked to grab their backpack the next. Looking at sleep, stress, and sensory load can reveal what changed.

What can cause a child to suddenly lose their ability to cope?

Before assuming your child is being defiant or uncooperative, check their body, load, and demand. These three areas can help you become a dysregulation detective instead of getting pulled into the behavior.

Body: Poor sleep, hunger, illness, or sensory overload can reduce flexibility.Load: Learning challenges, social stress, masking, busy schedules, or too many transitions can fill the stress cup.Demand: Homework, transitions, stopping screens, accepting “no,” or changing plans may exceed capacity at that moment.

The demand itself may not be unreasonable. The demand may simply be bigger than the capacity available right now.

How can I stop saying “But you did it yesterday”?