n4b.org
Early childhood nutrition has documented lifelong effects, it’s a priority for major foundations and UN agencies, and the organisations working on it are nonprofits without exception. Nutrition for babies names one of the most consequential areas in global health.
N4B also reads as network for business or nature for biodiversity, the latter fitting conservation, where funding grows as biodiversity targets get written into national commitments.
The 4-as-for pattern does what it always does: it turns three characters into a phrase a reader completes automatically. In the institutional sector that became the house style, so the name arrives legible rather than needing explanation.
Three characters, fixed supply, correct extension.
The name is listed for sale. Offers welcome.