Parenting Babies and Toddlers is Unique ID 354 in the IAB Audience Taxonomy 1.1, in the Interest branch under Interest → Family and Relationships → Parenting. Trillboards emits it on the bid request as a segtax=4 segment, the code every IAB-compliant DSP already reads, so a buyer already running "Parenting Babies and Toddlers" elsewhere can point that strategy at DOOH screens without rewriting taxonomy. Over the most recent 30-day window the network logged 3,095 cohort observations tagged with this segment across the 29,000+ screens registered on our own network.
Trillboards inventory concentrates in Taxi Rideshare Tv, Convenience Store, Retail Other. Taxi Rideshare Tv is the largest category at 14,760 approved screens, average floor $2.88 CPM. Those are network-wide venue counts; add a venue filter to the line item to hold delivery to the surfaces you want.
Buying one or two tiers up captures more of the network and less of the segment; buying this leaf does the reverse. The OpenRTB payload carries every level of the chain, so a single bid request can be targeted at Parenting Babies and Toddlers or at any node above it. Interest cohorts land hardest when the venue reinforces the interest, so pair the segment with a venue filter.