Hair loss is very common in pregnancy-all those hormones do crazy things to you so it's only to be expected that up to a few months after the pregnancy your body is still sorting itself out & therefore there will continue to be huge hormonal changes even after bubbas born.
Dying your hair also weakens it which could be why you get hair loss. Dyes contaning peroxide or amonia are very strong & often work to change the chemical structure of your hair. Frequent brushing & over use of styling products also weakens the hair.
Or it could be due to mild alopecia in which your immune system attacks your hair follicles.
I found some good info on-line:
causes:
physical stress: surgery, illness, anemia, rapid weight change.
Emotional stress: mental illness, death of a family member.
Thyroid abnormalities.
Medications: high does of vitamin a -- blood pressure medications -- gout medications.
Hormonal causes: pregnancy, birth control pills, menopause.
Causes of temporary hair loss include:
medication - drugs used to treat cancer, blood thinners, antidepressants and high blood pressure medications, as well as birth control pills and high doses of vitamin a, may cause hair loss.
Diet - too little protein and too little iron in your diet can lead to hair loss.
Stress or illness - you may begin losing hair one to three months after a stressful situation, such as major surgery. High fevers, severe infections or chronic illnesses can result in hair loss.
Childbirth - you may lose large amounts of hair within two to three months after delivery.
Alopecia areata - a condition in which hair loss occurs only in certain areas, resulting in hair loss patches the size of a coin or larger.
Thyroid disease - an overactive or underactive thyroid can cause hair loss. More information on thyroid problems:-
ringworm - if this fungal infection occurs on your scalp, it can cause small patches of scaling skin and some hair loss.