Your hubby may need to take supplements to help his
sperm, my hubby takes fertility plus for men ( which contains zinc,
l-carnitine,
l-arginine, co-enzyme Q10 among other things which are important for male fertility), EPA (fish oil - omega 3) and vitamin C. These were recommended by a nutritional therapist who has 25 years specializing in fertility.
Good luck huni, if you need to chat just give me a shout.