Harms of Sleep Training

If you are desperate about that please get help. I know it is frustrating sometimes especially if you are a single mom. Because "baby care" job is too much work for just one person. You do not have to show your strength with this one.
Anyhow all of sleep training does not work long term and you will risk losing baby's trust. Trust me, it is not worth it.

When a child cries, cortisol floods the body to help the child deal with the stress they are under. The rush of cortisol creates a fight-or-flight response in the body, putting the child under a lot of emotional and physical strain. Being subjected to this over and over again can be very damaging. Research suggests that children who have been conditioned to high levels of cortisol may be more prone to aggression later in life.

If a mother is nursing his baby, it is especially important that he feeds often at night. Levels of prolactin are higher at night time, and this hormone is responsible for milk production. Night time feedings should not be lasted until 12 months.

Solution is simple. Just snuggle to sleep. It is the natural way to do.