

Maybe the baby’s just a bobble head.
Unless the baby looked malnourished or uncared for, I wouldn’t worry. Babies are far more resilient, bendy and adaptable than we give them credit for.
Also, unless there’s a developmental issue, a seven month old would easily be able to hold their head unassisted. Is it possible the baby was just trying to look at things?
I wouldn’t worry about it then. Sleeping babies are a lot floppier than you’d expect - it won’t be doing any harm :)