ComplianceMay 7, 2026 · 4 min read

Mixed-age ratios — six examples from real Oregon centers

The OCC mixed-age rule is short — "the youngest child sets the cap" — but the math is where centers go wrong. Six scenarios, six answers.

If you've read our OCC ratio cheatsheet, you already know the rule: when a single classroom has children from multiple age bands, the ratio of the youngest child applies to the whole room. The problem is that "the whole room" gets ambiguous fast.

These are six real scenarios from centers we work with. The answers are the legally correct ones — your specific licensor may have stricter local interpretations.

Scenario 1: One 2-year-old in the 3s room

Room composition:
1 toddler (32 mo)
11 preschoolers (3 yr)

Staff present:
1 lead teacher

Out of compliance. The youngest child is a toddler, so the room is on the toddler ratio: 1:5. With 12 children, you need at least 3 staff. Adding one more teacher fixes it.

Scenario 2: A 36-month-old who turned 3 yesterday

Room composition:
1 child (just turned 3)
9 preschoolers (3–4 yr)

Staff present:
1 lead teacher

In compliance. The OCC age band for "preschool" starts at 36 months. The day the child turns 3, they're in the preschool band — 1:10 ratio. 10 children, 1 teacher: legal.

Scenario 3: After-school kids on the preschool bench

Room composition:
2 school-agers (5 yr, in K)
8 preschoolers (3–4 yr)

Staff present:
1 lead teacher

In compliance. The youngest children are preschoolers (1:10). With 10 total children, 1 staff is legal. The school-agers don't lower the ratio because they're older, not younger. This is the case most centers are surprised by.

Scenario 4: One infant in a toddler room

Room composition:
1 infant (10 mo)
5 toddlers (24–36 mo)

Staff present:
1 teacher

Out of compliance. The youngest child is an infant, so the room is on the infant ratio: 1:4. 6 children, 1 teacher = ratio of 1:6. Need a second adult.

Scenario 5: Mixed playground (multiple rooms outside together)

Outside group:
4 toddlers (24–30 mo)
10 preschoolers (3 yr)

Staff present:
2 teachers

Out of compliance. The playground is one supervised group. Youngest child (toddler) sets ratio at 1:5. 14 children needs at least 3 staff. Most centers solve this by sending toddlers and preschoolers out at staggered times.

Scenario 6: Sibling visit — older sibling in baby room

Room composition:
3 infants (4–11 mo)
1 preschooler (4 yr, visiting sibling)

Staff present:
1 teacher

In compliance — barely. Youngest is an infant (1:4). 4 children, 1 teacher = exactly 1:4. Legal, but you have zero margin. If a fourth infant comes back from the bathroom, you're over.

Why other ECE software gets this wrong. Brightwheel, Procare, and Lillio compute ratio per room template — they assume each room is one age band. As soon as your actual roster mixes ages (which most Oregon centers do daily), they show "in compliance" when you're not. RoundUp tracks every child's age band individually and computes the live mixed-age cap as kids check in and out. It's the only ECE platform we know of that does this.

The two-deep rule still applies

Even when ratio math says one teacher is enough, Oregon requires a second adult on premises at all times. In every scenario above, even the "compliant" ones, you need a second person somewhere in the building — not necessarily in the room, but reachable.

How RoundUp handles this

The Base plan ($99/mo) tracks every child's age band individually. As kids check in or out, RoundUp computes the live ratio cap for each room — including the mixed-age math — and shows it on the director dashboard. Yellow at 80% of cap. Red at the cap. Alerts on the director's phone before you go over, not after.

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Sources. Oregon Administrative Rules Chapter 414, Division 350 (Certified Child Care Centers). Last reviewed: 2026-05-07. These scenarios are simplified for illustration — your OCC licensor's interpretation governs. Not legal advice.