planning to travel USA based on previous employer

[sms8430]

hello, My husband is on h1b, our son is on h4 visa. we three of us got the valid visa in our passort from previous employer, however we havent done visa stamping yet for new employer..my husband has got approval notice from the current employer however we dont have h4 approval notice for the current employer.

My question is can we all travel to USA based on ny husbands approval notice of current employer and our valid visas from previous employer?

Note that - we do have h1b approval notice for current employer but we dont have h4 approval notice for our kid.

can we all travel based on valid visa without an h4 approval notice from current employer?

kindly guide us.