Face to face beds
Why not create a symmetry in the room in which each child seems to have their own bedroom, like inside a mirror? The beds are the same but opposite, and each wall has a different wallpaper, to create its own space.
Infant and baby bedroom
They are not winks of the same age, but they can share the same room. You can give the same room personality for a small child and for a baby. The crib delineates the two spaces, and you can separate the bed and the crib with a stool or dresser.
Second hidden bed
If you have to accommodate two children in the same room, but they use the same space to play or study, you can opt for a bed that fits inside the other as a drawer. During the day, they will have space to play or study, and at night the second bed is taken out.
A separate room with Japanese paneling
If the room is large enough so that you can separate the children's spaces, you can install Japanese walls or panels to delineate the spaces. Thus, each child will have their privacy, and the panels can be opened, if they want to play comfortably.
More information - Boy's room decoration style 1
Source - leroy merlin