Wrapped up from head to toe in a white bag and gently rocking from side to side, five Japanese mothers are hopeful Tokyo’s latest health trend can cure their post-pregnancy aches and pains. According to its exponents, Otonamaki, which translates as “adult wrapping”, was devised by a Kyoto midwife who thought replicating how children are swaddled at birth could help mothers overcome post labor shoulder and hip pain.