New hatchling clicking NOT chirping

[GingerDuck]

Help! My broody mama hatched her first 2 ducklings just last night. I checked them this morning and while they both are acting normally I noticed one of them is chirping while the other is making a clicking sound. Like she's trying to chirp but can't. What could be causing this and is there anything I should do for her?
Pic is mama with the 2 babies

 

[oldhenlikesdogs]

They look healthy. I would just leave it be. Hatching is exhausting. It may just be tired.