português para inglês Outra Outros

My text is about flight reservations. The sentence where the expression occurs:

"Quantidade de bebês de colo"

I am aware that English has the expression "baby in arms", but I am not sure it is really used like in Portuguese, to express that it is a very young baby.

Ahead in the text there is also the term "criança de colo":

"Valor da tarifa de bebê (criança de colo) equivalente."

Thanks for the help!