Check this
https://www.lufthansa.com/online/por...192509819&l=en
the best is to call the LH service center they will arrange the necessary for you..never had any probs with my kids
Phone 1
+1 800 - 645 38 80
Phone 2
+1 866 -846 42 83
Service hours
Text telephone for hearing impaired (TTY): +1-866-846-4283