my son is 7 months old and all he's been wanting to do is stand since he was about 5 months. but now he's stronger and heavier so its not so fun holding him up for minutes long for hours lol. is there anything i can make or buy that will hold him up and teach him to walk or even stand more stable alone?? he has a walker but he hates it, he makes this whining groan noise whenever he's in it, he just wants to hold onto something and stand