My baby is licking hands , bedsheets frequently. . A friend of mine has suggested to get  a teether . I need suggestions if teether is really required and which one is the best

You can use teethers if you wish... no harm in it... Also licking is normal... Just maintain proper hygiene...

if he is mouthing everything then teether would be good...u can get Mee Mee teether

yes Mee Mee water filled teether or normal silicone one