Compatibility is the demand and it is under-served nearly everywhere. A page per pump naming the bottles and adapters that work with it, a page per neck width listing every teat and lid that fits, and a cross-reference table a parent can scan are the highest-value pages a feeding brand can publish. They rank because the query is specific and the existing answers are forum posts, and they convert because the person searching is holding something that does not fit.
The second cluster is stage and material. Flow stage guidance built around a baby's age and the signs a change is needed, an explanation of how a vented bottle works that describes the mechanism rather than promising an outcome, a materials page comparing glass, polypropylene, silicone and stainless honestly on weight, durability and cleaning, and a sterilising page covering each method. The weaning range needs its own stage guide from first cups through to cutlery. All of them carry product grids.
Technically, capacity and colour are variants of one product while neck width usually is not, since it changes what the item actually is. Parts and spares need their own indexable pages rather than living inside an accessories drawer, because the search demand for them is real and specific. Discontinued bottles keep their pages so a household still using one can find the teats, and structured data carries material and capacity to match the feed.