Was getting sorted upstairs in nearly 5yo DD's bedroom earlier. DD was in 4mo baby DD's room playing with her.Baby DD was in her bouncer.
I went back into the bedroom to find older DD pushing on the bouncer chair making it shake/bounce pretty violently.
Obviously rushed over stopped her straight away and was firm with her about not doing it, and took baby.
Baby wasn't crying and didn't seem traumatised by it in any way, but i had seen her head move quickly back and forth afew times, lifting off the back of the chair slightly each time.
Baby seems fine since- no head injury related red flags (it happened a couple of hours ago)
Am I over reacting wondering whether to get her double checked at A&E in abit??