The song, "Please Be Careful" is sung by Ducky, Ruby, Littlefoot and Cera in the episode "March of the Sand Creepers" which the families are trying to get their rations without thinking that Sand Creepers are hiding in there or just trotting on them to be safe by Ducky to find a new home.
Lyrics
Excuse me
Watch out
Try to look down at the ground
Do be careful
Sand creepers are all around
No, no, no
Look at Ducky go
Helping creepers
Make their way
You think they'll be ok?
You know what she'd say
Cera, Littlefoot, & Ruby
Yep, yep, yep
Ducky
Please be
Careful
Try to look before you roam
Now go
This way
To be safe in your new home
