Types segmentation dissects the market by product modality, revealing distinct cost structures and development timelines. Small‑molecule drugs, representing approximately 45 % of the pediatric orphan portfolio, dominate due to established synthetic routes and lower manufacturing complexity, yet they face formulation challenges for pediatric dosing. Biologics—monoclonal antibodies, recombinant proteins, and vaccines—account for roughly 30 % of the market, reflecting the shift toward high‑specificity mechanisms for rare immune‑mediated and oncologic indications. Gene‑therapy vectors, primarily adeno‑associated virus platforms, occupy about 15 % of the market, driven by curative‑intent approvals for spinal muscular atrophy and hemophilia, albeit with substantial upfront investment and long‑term safety monitoring. Enzyme‑replacement therapies, a subset of biologics, contribute near 7 %, targeting lysosomal storage disorders where exogenous enzyme delivery remains the standard of care. Emerging RNA‑based modalities—including siRNA and antisense oligonucleotides—represent the remaining 3 %, offering precision targeting of previously undruggable genes. This type‑based taxonomy clarifies how each modality’s scientific risk‑reward profile influences overall market size and future pipeline composition.