Last Sunday, we celebrated Father’s Day.

There were cards with handprints, neckties that may or may not ever be worn, backyard cookouts, phone calls, social media tributes and children proudly presenting homemade gifts involving glue, glitter and questionable spelling.

Father’s Day gives us a chance to say what should probably be said more often: Dads matter.

But sometimes I wonder if we say it so often that it starts to sound like a greeting card instead of a truth with real weight behind it.

A recent Penn State study gives us another reason to take fatherhood seriously, not just as a sentimental idea, but as something that can shape a child’s health years down the road.

Researchers looked at how mothers and fathers interacted with their babies at 10 months old, how parents worked together when the children were toddlers, and then how those children were doing physically around age 7. They were especially interested in markers connected to heart and metabolic health, including inflammation and blood sugar regulation.

What they found was striking.

Fathers who were warm, responsive and developmentally supportive with their babies at 10 months were more likely to have healthier dynamics with the child’s mother when the child was 2. In those families, children showed better health markers years later.

In other words, the way a father interacted with his baby before that child could walk, talk in full sentences or form lasting memories was still connected to the child’s physical health in second grade.

That is worth sitting with for a minute.

We often talk about fatherhood in terms of provision, discipline, coaching, teaching life skills or showing up at big events. And all of those things matter. But this study points us back to the earliest, quietest moments of fatherhood.

A dad getting down on the floor with his baby.

A dad responding gently when his child fusses.

A dad noticing when the baby is overstimulated and needs a break.

A dad making silly faces, reading the same board book 400 times, changing diapers, singing off-key, offering comfort and delight.

Those moments may not look impressive from the outside. They do not usually make it into baby books. Nobody gives a trophy for calmly rocking a tired infant at 2 a.m.

But children’s bodies are listening long before children have the words to explain what they are experiencing.

Babies learn whether the world is safe. They learn whether their needs matter. They learn whether the big people in their lives are predictable, warm and available. They learn, in the deepest parts of their developing brains and bodies, whether stress is something they have to manage alone or something loving adults will help them carry.

This does not mean fathers are solely responsible for a child’s health. It does not mean mothers matter less. It does not mean every later health issue can be traced back to whether Dad was cheerful during tummy time.

Research does not work that way, and families do not work that way.

But the study does remind us that fathers are not background characters in a child’s development. They are not occasional helpers, backup babysitters or comic relief. Fathers help create the emotional climate of the home. They influence how parents work together. They shape the environment where a child’s nervous system, relationships and health begin to develop.

That should encourage dads, not crush them.

Because the takeaway is not that fathers have to be perfect. No parent is warm, patient and developmentally appropriate every minute of every day. There are days when the baby will not sleep, the toddler melts down in public, work stress follows you home and everyone in the house needs a snack and an attitude adjustment.

The point is not perfection. The point is presence.

A father’s consistent warmth matters. His tenderness matters. His ability to repair after frustration matters. His willingness to learn his child, not just manage his child, matters.

And this is where mothers, grandparents, employers, faith communities, schools and neighborhoods have a role to play, too. If we believe dads matter, we have to do more than applaud them once a year over barbecue.

We need to make room for fathers to be involved from the very beginning.

That means encouraging dads to take parental leave when it is available. It means not treating fathers as incompetent when they show up at the pediatrician’s office, the preschool classroom or the grocery store with a baby carrier strapped to their chest. It means workplaces understanding that fathers have sick children, school meetings and bedtime routines, too.

It also means helping couples build healthy co-parenting patterns early. When parents are competing for a child’s attention, withdrawing from each other or undermining one another, children feel that tension. When parents cooperate, encourage each other and share the work of caregiving, the whole family system becomes healthier.

So maybe one of the best gifts we can give children is not just an involved dad, but a supported dad.

A dad who is invited in, not pushed to the margins.

A dad who is allowed to be nurturing, not just strong.

A dad who knows that holding a baby, soothing a toddler and working as a true partner are not side jobs. They are central to fatherhood.

Since we just celebrated Father’s Day, it is tempting to pack the gratitude away with the cards and move on. But the real work of fatherhood happens in the ordinary days after the holiday.

It happens in the bedtime routine.

It happens in the car seat buckle.

It happens in the kitchen while cutting grapes into impossibly tiny pieces.

It happens when a father puts down his phone, looks into his child’s face and says, with his attention as much as his words, “I’m here.”

Years from now, that child may not remember the moment.

But their body just might.

Lauren Hall is the President and CEO of First Things First. Contact her at lauren@firstthings.org