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

Here is Why You Need An Adapter

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

Singapore

In Singapore, outlets of type G are in use.

Type G

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