The JustGiving page had raised more than £5,000 by Monday evening, less than a day after being set up for the family of two-week-old Ciaran Leigh Morris.
The baby was being pushed along the pavement by his family on Easter Sunday when a BMW crashed into a Ford B-Max in Brownhills High Street and then into the pram, which was left trapped between the BMW and a wall.
Ciaran's death was later confirmed hospital. A relative suffered a shoulder injury but nobody else was injured.
As the community began to come to terms with the tragic events of the crash, members of the public laid flowers at the site on Monday and launched a fundraiser to support the boy's family.
More than 400 people had donated to the fundraiser by Monday evening.
Karl Roberts launched the page saying: "On the 4th of April, a traffic collision occurred on Brownhills high street that resulted in the loss of life of a two week old baby. We are trying to raise funds to support the family at this very difficult time."
Hayley Westwood donated on the site saying: "I'm so so sorry for your loss. No parents should have to go through what your going through. Such sad news. My thoughts are with you both. Rest in peace sweet little Angel xxxxx"
Jenni and Jason Butler posted saying: "We are so so sorry this has happened, we are sending our love and condolences at this awful time and cannot begin to imagine what you are feeling Sending love Jenni and Jase x"
Danielle Birch said: "RIP little baby boy! Sending my love to your mummy, daddy and family during this extremely, unbearable and daunting time. I hope you all know just how much we will all continue to support you!"
Stella Morris said: "We may be distanced, but we're all devastated. This is the least I can do. Nothing I say can change what as happened. If I could put everything right I would in a heartbeat. RIP precious angel."
Jeannie Hazlewood-Jones added: "Utterly heartbreaking. We hope this helps in any way you need it to."
Daniee Nicole said: "Such a tragedy. I am so sorry for the loss of your beautiful little baby boy. Sending love and strength to all of you. R.I.P little angel."
To donate visit justgiving.com/crowdfunding/brownhills-rtc-04-04
A 34-year-old man alleged to have caused Ciaran's death by dangerous driving has now been charged. James Paul Davis is also accused of driving without insurance, leaving the scene of a collision and failing to report a collision.
A passenger from the BMW and the occupants of the other vehicle were said to be helping police with the enquiry.