Puppy pads over night only?

My 15 week old Chihuahua is a wonderful little pup. He was rehomed to me at 11 weeks old, and the breeders did a great job training him up until then.

He is doing great with toilet training, with very few mistakes and if there is a mistake it is always on a puppy pad inside. He sits on the puppy pad and stares at you when he wants to be taken out, or I ask "do you need the toilet?" and if he does, he jumps onto me in order to be taken out, its very sweet.

He routinely gets his naps throughout the day and plays nicely and is occupied easily. Very rarely are we bitten and it is always due to overtiredness if it does happen.

He always sleeps through the night, bar waking up once to independently toilet on a puppy pad. He sleeps in his own bed, but on my bed with me. Occasionally he sleeps in my arms which melts my heart.

What I am wondering: is the toilet situation in the night okay? Or will this be undoing the outdoor toilet training? And will him being carried outdoors to the toilet be an issue too? He currently doesnt have open access to the back door, so its just easier this way at the moment.

Thanks in advance