Low libido is not abnormal in mothers of young children. The hormone prolactin in women causes this. Other factors that may be causing this are antidepressant medication, depression itself, being tired/stressed out.
To rule out physiological causes, a blood panel test can show hormonal abnormalities.
There are natural options that you may explore such as Macuna pruriens, Tribulus or hypnotherapy. Others would be couples/sex therapy depending on what you'd like to look into.