My baby girl is a month old.she weaps too much.........help me out plz..........!?

my baby girl is a month old.i m feeding her all day long and giving her formula at night just twice........sweap.she weaps too much.whenever i put her on bed or in crib she start weaping she just need my lap.i feed her wen she sleepsi put her on bed she just wake up n start crying.sometimes i let her weap for 2 to 4 mins.but today when i let her weap.she didn't stop weaping even after 7 mins.so i had to pick her up.then i fed her.when she slept i again put her on bed but she woke up right away n strat crying.i dont know wat to do.she is bothering me tooooooooo much............someone plzzzzzzzzzzzzzzzzzzzz help me out of this...thnx