Can kids know the gender already

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Do kids know the gender of the baby before you find out??? I’m ask because with my first born I asked my nephew who was I believe 5 and he said girl and I had a girl and now I’m pregnant with my second and my 2 year old daughter and child’s father both have been saying this baby is a girl I feel it’s a girl but idk I feel like kids are right ...plus with my daughter I had so many names to pick from for her but boy names I couldn’t come up with nothing and now it’s the same again I can’t think of any boy names but I fife many girl names