Thank you for your query.
As a mother I can understand your anxiety
. However, the way you describe there should not be any need to worry. You need to watch for the following signs:
2. Unnecesary and excessive crying
If these symptoms appear then you need to consult a doctor immediately.
Fortunately a newborns skull is very resilient and should not get injured by the bump.
I hope I have allayed your anxiety and satisfied you. Do revert back in case you need any further clarifications.
Wishing both your children all the best.