The strikes came after coalition soldiers faced fierce fighting from groups of Saddam's faithful Republican Guards south of the city.
The US has admitted they didn't expect such strong fighting from Iraqi soldiers and said it was slowing down the coalition forces.
They are now sending almost 120,000 more troops to Iraq.
Iraq's Defence Minister warned the troops will have to do lots more fighting on the streets if they wanted to get into Baghdad.
US troops have also faced strong resistance from another group of Saddam's well-trained soldiers called the Fedayeen.
Fights have been going on between them in a big battle in the town of Samawah, where the US have been trying to get control of an important bridge.
In Basra further south, it's been reported hundreds of Iraqi refugees have left their homes to find food and water.