My 45 days baby cries a lot and also very loud in evening till her night sleep. I consulted with a doctor and she gave medicine for cold only but still my baby is in same position. Is it serious or normal?? Also she sleeps in my lap and when I put her down on bed she gets up just after 5 minutes and cries.

It could be due to colic pain. Perhaps you can look for some home remedies to sooth colic or change positions while feeding the baby. Sometime babies cry for no reason at all but just that they are not happy with the way they're being held. Try changing your baby's usual sleeping and holding position and see if it works. Else, go for a second opinion