If a couple is taking a walk with their child while she is a niddah, can the child hold on to both of their hands?
If the child cannot walk on his own and the parents are supporting his walking then they should not be holding both hands. However if the child can walk on his own then it is permitted according to most poskim. The reason is because you are will feel your wife’s movements by holding your son’s hand, and it isn’t like holding something stationary, like a plank of wood. There is however an opinion that says that one should preferably be careful about this.
Pischei Teshuva Y:D 195-2, Tahara Khilchoso 14 15, ftnt. 32, Ohel Yackov ( Harchakos) pg. 111 in the name of Avnei Yoshpe. However R’ Vosner zt”l ( Shiurei Shevet Halevi pg 253) says that one should preferably be machmir. Also it is brough in Ohel Yackov (pg. 104) From R’ C. Kanievsky that “hamachmir tavo alav bracha”.