Hypothyroidism during pregnancy causes defective development and maturation of the growing foetus leading to stunted growth. Low secretion of GH results in stunted growth resulting in pituitary dwarfism. Pars distalis or anterior pituitary Produces Growth Hormone. prolactin (PRL), Thyroid stimulating harmone (TSH), Adrenocorticatrophic Hormane (ACTH), Lutenising Hormone (LH) and Follicle Stimulating Hormone (FSH).