Nap problems!!

Isabel

I have a 10 month old and we are having some

Issues with naps, specially the second nap of the day... he is tired but refuses to sleep, once I rock Him and sing something he goes to sleep, however, if I try putting him in his crib, immediately wakes up and starts crying. As soon as I pick him up he settled again and goes to sleep instantly in my arms. Anyone going through the same?! Suggestions?! Tips?! Desperate mother!!!