I have lambs that won't answer their mums, a mum that won't answer her lambs, a goat who keeps forgetting where she's put her kids - the kids are lying there blamelessy, but they don't answer when she shouts in a panic either.
Who know what goes on in those ovine and caprine heads!
Fortunately, the majority of babies and mums talk to each other.
It is endlessly fascinating how the mums and babies interact and vary in response from one to another.
Unless of course you are listening to a screaming ewe whos lamb is pointedly ignoring her as thats the fifth time in 30 minutes shes decided shes lost her lamb who is in reality not lost and keeping a watchful eye on her from a distance where he isn't deafened by her screams!