Every feed involves two people. Most feeding assessments only look closely at one.
If you're a PT or OT, you were probably trained to evaluate the baby: tone, posture, reflexes, oral motor skills. If you're an IBCLC, you may lean toward the breast, the latch, and milk transfer. Both views are valuable. But feeding doesn't happen in the baby alone or in the breast alone. It happens in the space between them.
What we mean by the dyad
The dyad is the baby and the lactating parent as one functional unit. Each body adapts to the other, feed after feed. A baby with a shallow gape changes how the nipple is compressed. A parent with a fast letdown changes how the baby organizes their suck. A parent in pain holds the baby differently, which changes the baby's neck position, which changes the latch.
When we only assess one side, we often end up treating the adaptation instead of the cause.
A common miss
Consider a three-week-old referred for "poor latch." The baby clicks, loses suction, and comes off the breast often. Oral motor exam shows mild tongue restriction. The obvious next step is a referral for release.
Now look at the other half. The parent has an oversupply and a forceful letdown. The baby is clicking because they're trying to slow the flow down. Their tongue is doing a protective job. A release won't solve that baby's problem, and it may not be what that baby needs at all.
Neither finding was wrong. The picture was incomplete.
What a whole-dyad assessment adds
A whole-dyad assessment doesn't mean every clinician becomes an expert in everything. It means asking a wider set of questions every time:
The baby: How organized is this baby? How do they move, regulate, and recover? What do their oral motor patterns look like at rest and at the breast?
The parent: What does their anatomy, supply, and flow look like? Are they in pain? How did their own birth and recovery go?
The fit: How do these two bodies meet? What changes when we change position, timing, or support?
The context: Who is home? How much capacity does this family have to follow a plan?
The fit is the piece most often skipped. A baby and a parent can each look fine on their own and still struggle together.
Why it matters for outcomes
The families who reach us after three or four other providers rarely have one problem. They have a stack of small ones, each seen by a different person. Assessing the whole dyad is how we find the piece that's actually holding the others in place.
This way of working is at the center of what I call Functional Lactation: looking at feeding as a whole-body, whole-family function rather than a latch to fix.
Dr. Emily Spaeth, PT, DPT, IBCLC, is the founder of Be Well Baby® in Portland, Oregon, and teaches in Pacific University's Doctor of Physical Therapy program. If you're a PT, OT, or IBCLC who wants to work this way, join the waitlist for the Functional Lactation Intensive.
