If you're in need of free diapers for your baby there are diaper banks around some places that will provide you with some diapers if you're low income or have lost your job.
You'll need to provide some paperwork though to get the free diapers at the diaper bank.
You can get free samples of things for your baby if you look online. Some places will send you free baby things if you agree to review them.
You can make a blog to review the baby products you receive on your blog and another plus if you have a blog you can make money eventually with advertisements.