Jungkook: Beinh his shy typical self, Kook WOULD be a little awkward while watching but he'll be so amazed and he'll hold your hand.
Jin: He would buy balloons and he knows how you feel (since he too gave birth to the maknae line) and he'd kiss your forehead and stuff. He'd be his romantic cheery self, saying stuff like "you can do it!" To make you feel better.
Yoongi: he'd high key be overjoyed. Yoongz would rub your hand continuously and he'd keep on smiling and laughing.
Jimin: Mr. Affectionate would take your hand in his and kiss it continuously. He might be a little shy at first but he won't let that stop him from comforting you. Jimin would stroke your hair and whisper loving things into your ear.
Namjoon: He'd won't be awkward with this at all, he'd confidently hold your hand and wipe the sweat off your forehead. He'd watch when the child is born and he'd kiss both of you. Also, he would laugh while watching (not at you) to lighten the mood.
Taehyung: Tae won't be THAT crazy and weird. He'll be quite serious and caring while watching you and he won't feel shy unlike the others. He would be gently stroking your forehead while praying in his head and thanking god for the baby when it arrives.
Hoseok: Hobi would be really bright as always, but this time it's be a serious-bright. He would cry from happiness when the baby is born and help the nurse. He will also give you water and help you relax while giving birth. He did be really amazed while watching and he will be smiling 69 times more than usual.