I got similar situation on my first baby. I even need to eat painkiller and many other pills that I don't remember. Even need MRI to check. Bcoz it worsen till I can't even write. Then, cannot tahan already. Doctor say really cannot carry your child anymore if I want to get better. So, I find ways to play with my baby so I need not carry him. Then, I found that he like to play with his blanket. So, I'm saved.

Try to find other ways to entertain your baby besides carrying.

My boy's at birth is 3.0kg/51cm. Came out thin but but always have long feeding time. So, gain weight really fast. I remember at 9 months, I brought my baby to the clinic. Babies still have to undress everything to scale (lie down to scale because still cannot stand up). The nurse tell me, "Eh...satu tahun ke atas tak payah buka baju. Timbang berdiri saja". Hahaha...you can imagine how big he is. He is not fat u know...just solid and tall.

TS: Find a good 跌打 (chinese physiotherapist), rather than get tonnes of medicine. This case, meds can't heal you. Also, a tukang urut bidan (I think that's what they call) for your wife. My area, I go for malay/siamese (thai style) really good. Can help ease the pain.

Try to observe what catches your babies attention. I got my son on a baby walker around 5+ months since he likes to jump. When I hold him, he just jumps non-stop. I counted once you know...1000 times! I yg tak tahan. I stopped him, he's not even tired yet.

What else I did:

Lay down a thin big mattress on the floor. Play toss around. Make it exciting. Boxing with teddy bear...let him punch also. Play inside blanket or a tent. Some more you can lie down more...hahaha

And many more...you'll get more creative from there

hahaha...later when your baby is grow bigger, like mine (5 yo)...your tap water always run coz he turn the tap on but always forget turn it off

That's why they say a baby has more stamina than a badminton player