I don’t really pronounce it as ‘bəˈluːn’, it is more like a combination between ‘bluːn’ and ‘bluːm’. However, you can be sure that I know what I mean because I point to balloons every time this word comes out of my mouth.
Later update: I became better at pronouncing the beginning of the word, but I kinda lost the end. Now I call all spherical objects ‘bəˈluː’.Please vote for us on Top Baby Blogs. Thank you!