Baby Boy Costumes for First Halloween

For a baby boy's first costume, easy diaper changes and soft fabric beat a dramatic shell. Look for a romper or bodysuit base with snaps or a zip at the inseam, so you never pull the whole thing over his head, and skip masks, stiff polyester, and tight neck elastics. Sizing runs by month, not one age label: newborn, 0-3, 3-6, 6-12, 12-18, and 18-24 months. Size up if he'll wear it over a winter onesie for late-October trick-or-treating. Boy-leaning makers favor dinosaurs, dragons, sharks, lions, foxes, and little-monster hoods, plus woodland and first-Halloween prints in green, navy, rust, and mustard. Soft cotton, bamboo jersey, and minky fleece sit best on new skin. Prices run about $18-$35 for a printed first-Halloween bodysuit, $25-$55 for a hooded animal romper, and $45-$95 for a structured bunting with hood and booties. Many shops ship ready-made sizes in 3-7 business days; embroidered or made-to-order pieces usually need 1-3 weeks, so order early for late October.

Use the size-in-months and theme filters to narrow down, or tap a related search for specific looks like dinosaur rompers or first-Halloween sets.