An important question that I keep getting asked is if Cannabidiol, or CBD is safe for breastfeeding and pregnant mothers? The short answer is YES! Not only is pure, organic cannabis oil safe, but our bodies actually make cannabinoids naturally! We most likely eat other foods that have fatty acid neurotransmitters and cannabinoids unknowingly! Until recently, only one other food was believed to have the cannabinoid chemical, anandamide- Chocolate! More recently, however, science discovered that foods such as truffles, celery, and parsley among other herbs also have what is known as anandamide- the Bliss Molecule! It is a newly known fact that we have endocannabinoid receptors ready to accept cannabinoids from internal and external sources. Science discovered that our bodies have to make something itself in order to have receptors for it! We actually make anandamide in the body by feeling blissful, and we have receptors for it!
Anandamide is the neurotransmitter, or chemical, that has been isolated in chocolate and found to also be produced naturally in the brain! Our brains make it! Anandamide binds to THC receptors and brings "bliss, joy, and happiness," hence the name Ananda, which is from the Sanskrit word of the same meaning!  This is the scientific reason why real dark chocolate or cacao is said to prevent depression!
So let's talk about how cannabinoids are important for fetal development! While there is still a lot of research that needs to be uncovered regarding our endocannibinoid system, one thing is for sure, and it's that cannabinoids have a role in conception and pregnancy! Interestingly enough, it has been discovered that the endometrium, or the lining of the uterus contains anandamide. Anandamide is needed to keep the newly fertilized embryo attached to the uterine wall.  Therefore, CBD directly plays a role in the early stages of fertility. Could a CBD deficiency from the nearly one hundred years of cannabis prohibition be the main factor of why 6.1 million women are having fertility issues? Could CBD deficiency also be a reason why millions of women have endometriosis, ovarian cysts and other female problems?
An article from Pub Med (dot) gov written in 2008 states that there are multiple roles for the endocannabinoid system during the earliest stages of life in prenatal and postnatal development!  It is also believed that further research on the endocannabinoid system and pregnancy could help determine treatments for infertility, mental retardation, cystic fibrosis and non-organic failure to thrive. 
One of the amazing findings by studying mice is that breastmilk contains cannabinoids! After a detrimental study on baby mice, it was discovered that cannabinoids in breastmilk are what stimulates babies with the desire to suckle, while also calming and relaxing the baby!  The mice who were deprived of cannabinoids were unable to suckle and they eventually died.  New research is being uncovered that CBD compounds are produced naturally in breastmilk to protect the infant against infections and contribute to a mature immune system. It makes perfect sense because breast milk is known to change with a baby's saliva to create the perfect cocktail of healthy fats, proteins, living cells, antibodies, enzymes, hormones, and now cannabinoids.
Cannabinoids are also neuroprotective for the baby. The endocannabinoid system, or ECS, is a vital bridge between the body and the brain.  The ECS is a vast neurotransmitter network that plays a role in a wide variety of bodily functions such as memory cognition, sleep, appetite, mood, fear, attention, pain, reproduction, immune function, movement, pleasure among many other roles in the body.  The endocannabinoid system is so large and vital that almost every organ on the body expresses cannabinoid receptors.  The system is a vital bridge between the body and brain, and endocannabinoids like anandamide are the messengers that keep the system running. 
Please read the attached references and disclaimer below and do further research until you are comfortable using cannabinoids safely!
Disclaimer; A friend of mine once told me that if you look for something on Google you will find it. If you look for info to promote something, it will be there. If you look for info against something, it will be there. I'm not sure if I'm saying this right, so what I'm trying to say is: Use your own research skills to make comfortable informed decisions that will affect you and your children. These decisions could affect you or them for life. This goes for everything you put in and on your or their body, including food, water, and vaccines. Even skin lotion. I am not responsible for your Use or Misuse of Cannabinoids. While I am a medical professional, I am not a physician. Most physicians don't even know about this stuff. So like I said, research, research, and then research some more until you are comfortable making decisions. I am only presenting the research I have discovered, but it is up to you to make choices you are comfortable with. This is a comprehensive limitation of liability that applies to all damages of any kind, including (without limitation) compensatory, direct, indirect or consequential damages, loss of data, income or profit, loss of or damage to property and claims of third parties. Information on this site is provided for informational purposes only and is not meant to substitute for the advice provided by your own physician or other medical professional.