Why Your Toddler Suddenly Can't Let You Go (And Why That's Actually Good News)

When "fine" suddenly isn't

They were fine at drop-off for weeks. Months, maybe. You did the short and sweet goodbye, gave a hug, and felt so relieved that drop off went smoothly. Suddenly one morning, your toddler grabs your leg and begins to cry when you try to leave.

This is common in August, as many children are experiencing some sort of transition. Whether it be a new teacher and classroom, or the end of summer togetherness, the end of summer brings with it many shifts. It may seem like something is wrong with your child, but it actually just means a new stage of development.

While doing weekday drop-offs with my firstborn, she went through phases where she happily waved goodbye and waltzed off to play with her friends. There were other days where she cried and did not want me to leave. This is all normal and okay. If you need a short, practical drop-off playbook alongside this developmental frame, see What to Do When Goodbye Feels Too Big for Your Preschooler.

What just happened in your toddler's brain

Separation anxiety comes in waves. The first wave hits around 8 to 14 months, when your baby begins to develop object permanence. Your baby now knows you exist when you leave the room, and knows you are not there. The second wave arrives around 18 to 24 months, when memory and attachment get stronger. The third wave, the one nobody warns you about, lands between 2.5 and 4 years.

The third wave is what many families are living through right now. Your toddler can now imagine you leaving before you leave. They remember that you left last time. They feel the difference between "mom is in another room of the house" and "mom is going to work."

Here is the counterintuitive part. Securely attached children often protest separation more in these waves, not less. Their protest is a sign that they really are connected to you. You are their secure base, their lighthouse in a storm. When you leave, they feel that loss of connection, and it's appropriate and normal for them to be sad or upset about that.

Why surges mean growth, not regression

A new behavior means the brain built something new. Your child can now hold the idea of your absence in mind. They can feel it before it happens. That capacity is cognitive growth, even when it shows up as clinging and tears at the door.

The wave will pass… and probably come back at another time. Both are normal. Each wave means the brain is building a more sophisticated understanding of what absence feels like and what return feels like.

This is a developmental exercise your child is completing. Our goal as parents is not to make separation anxiety go away. Our job is to help our children build tolerance for the feeling of missing you.

I also am developing my own tolerance for missing my children! Sending my firstborn off to kindergarten was relatively easy on the first day, but I found myself in tears the second day. Even as an adult, I am constantly growing my feelings muscles, or my ability to tolerate more and more emotions. Part of parenting is learning to let my children go and have new experiences sob. We are all in this together.

When Mom Goes Out models coping skills that your child can practice as they feel separation anxiety. In this story, Eden feels sad that her mom leaves. She learns to tolerate it with her dad's gentle support. Then she can feel joy at mom's return. Each time she survives this emotional cycle, she learns that she can tolerate these feelings. Other books about goodbyes that I have enjoyed reading with my kids include "Llama Llama Misses Mama" and "The Invisible String."

What to do when the wave hits

Your child is very sensitive to your body language. If you are feeling guilty, rushing around, or bracing for the meltdown, your children can sense that. As you prepare for separation, try to regulate yourself first. That calm, sturdy presence is the heart of co-regulation — your child borrows your nervous system while they learn to manage their own.

Then be a role model and call out the feeling. "You're sad because I'm leaving. You're going to miss me. That's okay." Stay present in the feeling. Then provide reassurance that you will return.

We love you no matter how you feel. Even the feelings that show up clinging to your leg at the classroom door.