It is generally safe to engage in lip kisses and hugs during the second month of pregnancy. The baby is well-protected by the amniotic sac and uterus, so gentle physical affection poses minimal risk. However, it's important to maintain good oral hygiene to prevent the transmission of bacteria or viruses that could potentially harm both the mother and the baby. Regularly brushing your teeth, flossing, and using mouthwash can help reduce any potential risks. If either you or your wife have a cold sore outbreak or any other contagious oral condition, it's best to avoid direct contact until it has healed to prevent transmission. As always, if you have any concerns or questions, consult with your healthcare provider for personalized advice.