To give Biogaia to your 1-month-old baby to help with their cramps and gas, you can administer it like you would give drops of vitamin D, either on a pacifier or mixed in with their milk. It is recommended to try it for 2 weeks, and if there is no improvement, discontinue use. If it works well, discuss with your doctor during the next appointment at 3 months for a prescription and medical follow-up. Additionally, you can try some tips mentioned in the article provided.