here is a free resource i made ,
a native cradle board with a sleeping baby also a baby you can rock to sleep
use / cradle 1 to spawn in the cradle board with the sleeping baby use /dcradle to despawn
and use /baby 1 to spawn in the baby and press p to start rocking the baby use /dbaby to despawn
i wont be making these items , just commands
as i was asked to make this for someone a while back and decided i may aswell release it now for free 
download -
Rock_the_baby_and_Cradle_Board.zip (21.6 KB)
| Code is accessible | Yes |
| Subscription-based | No |
| Lines (approximately) | 600 |
| Requirements | /NA |
| Support | Yes |