Thank you for your query,
Infants will cry for the following reasons:
or any discomfort
3. Wetting due to urine or stool
5. Ear pain
or nose block
So your child seems crying at bedtime before putting to sleep, means your child wants to pich and hold with mother or any care taker.
Nothing to worry and this is normal and as the age grows, their interaction will increase and they need response from their care takers to their emotions.
Infant cry lead to mother response which in turn lead to satisfaction of infants needs- this reciprocal responses are important in the development and indicates secured attachment.
Hope I have answered your query.