How long are dolphins pregnant?

10 - 12 months

typically about 12 months

A dolphin's gestation period lasts for 10 - 12 months in the female, with calving peaks in the spring and fall seasons.

These are the documented figures; individual animals vary and a veterinarian is the right reader of any concern.
Grounded in: kids.nceas.ucsb.edu, scholar.lib.vt.edu. Every figure above appears verbatim in the linked sources.
Our other tools
feedornot.com can dogs, cats and chickens eat that?
checkthetemp.com USDA safe cooking temperatures
isitstillfresh.com how long food really lasts
freezeornot.com what freezes well and how long it keeps
getthestainout.com gentle stain removal, step by step
readthetag.com laundry care symbols, decoded
substitute.kitchen ingredient substitutions that scale
whichbug.com identify a bug from what you can see
ismyplantdying.com diagnose a struggling plant
aquariumstudio.ai aquarium care and tank help