You Do Need power plug adapter while traveling from Myanmar (Burma) to Belize.

Here is Why You Need An Adapter

The outlet and plug type used in Belize are A, B and G and in Myanmar (Burma) are A, C, D, G and I. This is how they look like.

Myanmar (Burma)

In Myanmar (Burma), outlets of type A, C, D, G and I are in use.

Type A

Type C

Type D

Type G

Type I

Belize

In Belize, outlets of type A, B and G are in use.

Type A

Type B

Type G