At the
time, I
definitely worried whether he would ever get used to going to sleep
for bedtime in his crib (which he did easily
for naps) and if I was working against myself in terms of sleep training, but it all worked out just fine!
The second image displayed by a commenter is not safe
for nap and is to be used
for play, entertainment, soothing and neck strength exercise
for as long as you might do tummy
time or until the baby falls asleep at which point you would move them as soon as possible (once
definitely asleep) to a sleep certified crib.