hello doctor, my son age 4 months and 9 days. He keeps on chewing his finger or arm or his t shirt. when I gave my finger in his mouth then I realised that may be he is facing teething problem. Is teething starts so early? And i have Mee Mee finger brush that he chews but chewing that causes Gas? As past 3 days he is passing Gas also as compare to other days. He is on breast milk. Kindly help me solve his teething and gas issue?