Before we had a baby we occasionally babysat for a friend's little boy. His bedtime book for a while was Jez Alborough's Hug.
I'd forgotten about Hug until I spotted it in the bookshop today and bought a copy. It's the story of Bobo, who spotting all the other animals enjoying a hug, gets more and more distressed until he finds his mummy for a hug of his own.
Until I had a baby I don't think I realised the sheer terror the thought of your baby needing a hug and not being able to get one can bring, and the absolute love Alborough gets across in his picture of Mummy and Bobo finally getting their hug. The baby got it too. We read it once and she immediately turned to me and nestled in for a glorious, breath each other in deeply, wonderful hug.