dries89, is this bird in the states or elsewhere?
In general I agree with donrae. If you look close, it does seem like there might be a darker feather coming in on the shoulder, and there might be some pointy feathers in the saddle and the tail feathers look like they are going sickle-shaped... but I really would think there would be more obvious signs at 5-months. Everytime I thought I had a young Brahma cockerel, and waited and waited for obvious signs, I ended up with a pullet.
For example, look at the images of some younger Buff Brahmas in this thread:
https://www.backyardchickens.com/t/530033/buff-brahma-rooster
In general I agree with donrae. If you look close, it does seem like there might be a darker feather coming in on the shoulder, and there might be some pointy feathers in the saddle and the tail feathers look like they are going sickle-shaped... but I really would think there would be more obvious signs at 5-months. Everytime I thought I had a young Brahma cockerel, and waited and waited for obvious signs, I ended up with a pullet.
For example, look at the images of some younger Buff Brahmas in this thread:
https://www.backyardchickens.com/t/530033/buff-brahma-rooster