If the baby is struggling to sleep after being held, a tip is to place a muslin under your T-shirt whilst the baby is being fed.
Then, when the baby is placed in their cot / basket / bed for their sleep, place the muslin in with them at the same time.
The theory is, your scent is transferred to the muslin, so when its placed in with the baby, they can smell the scent, and are tricked into thinking that they're still close to the parent, and feel secure, and so they'll sleep.
Information in this blog is from my own personal experience / observation and only for my own reference. If you find it useful, then great, buy it shouldn't be considered "gospel", and your own experience may and will differ as each baby / situation is different.